Name: hormone imbalances and their effects
Uploaded: 2024-10-24T14:03:06.000Z
Duration: 1 min 27 s
Channel: JoVE

Gli ormoni sono i messaggeri chimici che coordinano i processi complessi nel corpo.
L'ossitocina è sintetizzata nell'ipotalamo e secreta dalla ghiandola pituitaria, favorendo il legame e le interazioni sociali promuovendo sentimenti di fiducia, empatia e connessione.
Il cortisolo, l'ormone dello stress, è prodotto dalle ghiandole surrenali. Aumenta i livelli di glucosio nel sangue per produrre energia, gestisce lo stress e regola la pressione sanguigna.
L'adrenalina, nota anche come adrenalina, viene rilasciata durante lo stress. Accelera la frequenza cardiaca, espande le vie aeree e aumenta l'energia, preparando il corpo a risposte rapide alle minacce.
Gli estrogeni sono vitali per la salute riproduttiva femminile. Regola i cicli mestruali, aiuta lo sviluppo riproduttivo e influisce sulla densità ossea, sulla salute della pelle e sulla gestione del colesterolo.
Il testosterone, principalmente un ormone maschile, è essenziale per lo sviluppo del tessuto riproduttivo, migliora la massa muscolare e ossea, promuove la crescita dei peli del corpo e influenza la libido e la stabilità dell'umore.
Infine, la tiroxina, prodotta dalla ghiandola tiroidea, è essenziale per il metabolismo e la gestione dell'energia. Influenza la frequenza cardiaca, la digestione, lo sviluppo del cervello e la salute delle ossa.

i principali ormoni e loro funzioni

Gli ormoni, i messaggeri biochimici prodotti dalle ghiandole endocrine, sono fondamentali per regolare le funzioni corporee e mantenere l'omeostasi. L'equilibrio del valore di ogni ormone è cruciale; gli squilibri possono portare a delle significative interruzioni fisiologiche. I principali ormoni includono l’ossitocina, il cortisolo, l’epinefrina, gli estrogeni, il testosterone, la tiroxina, l’ormone della crescita, l’insulina e il glucagone.

L'ossitocina, prodotta nell'ipotalamo e rilasciata dalla ghiandola pituitaria, svolge un ruolo nei legami sociali, nel parto e nell'allattamento. La sua iposecrezione può impedire le interazioni sociali e le risposte allo stress, contribuendo potenzialmente a portare a condizioni come la depressione. L'ipersecrezione dell’ossitocina, sebbene meno comune, potrebbe esagerare le contrazioni durante il parto o causare un riflesso di eiezione del latte iperattivo durante l'allattamento.

Il cortisolo, secreto dalle ghiandole surrenali, regola lo stress, il metabolismo e le risposte immunitarie. L'iposecrezione di cortisolo causa la malattia di Addison, che si manifesta con affaticamento e debolezza muscolare, mentre la sua ipersecrezione porta alla sindrome di Cushing, caratterizzata da obesità, ipertensione e alti livelli di zucchero nel sangue.

L'epinefrina, secreta anche dalle ghiandole surrenali, aumenta la frequenza cardiaca e la produzione di energia in risposta allo stress. La sua iposecrezione può indebolire la risposta allo stress, mettendo a repentaglio la sopravvivenza in situazioni acute, mentre l'ipersecrezione può causare sintomi di stress persistenti, come ansia cronica e difficoltà cardiache.

L'estrogeno, prodotto prevalentemente dalle ovaie, è essenziale per la salute riproduttiva femminile, influenza il ciclo mestruale, la densità ossea e i livelli di colesterolo. Quando l'estrogeno viene secreto a livelli inferiori al normale, può portare a irregolarità mestruali e ad un aumento del rischio di osteoporosi dovuto alla diminuzione della densità ossea. D'altra parte, l'ipersecrezione di estrogeni è associata ad un rischio elevato di tumori al seno e all'utero, riflettendo il ruolo critico ma delicato dell'ormone nella crescita e nella replicazione cellulare. Il testosterone, prodotto principalmente dai testicoli, è associato ai tessuti riproduttivi maschili, alla massa muscolare e ossea e alla crescita dei peli corporei. L'iposecrezione di testosterone può causare una riduzione della massa muscolare, una compromissione della funzione sessuale e una diminuzione della densità ossea, spesso portando all'osteoporosi. Inoltre, può influenzare la stabilità dell'umore e portare a sintomi depressivi. Al contrario, una produzione eccessiva di testosterone o ipersecrezione può predisporre gli individui a condizioni come l'ingrossamento della prostata ed è stata collegata a un aumento dell'aggressività e dei disturbi dell'umore.

La ghiandola tiroidea, situata nel collo, secerne la tiroxina, che regola il metabolismo, la crescita e lo sviluppo. L'ipotiroidismo deriva dall'iposecrezione di tiroxina, rallentando il metabolismo, causando l’aumento di peso e letargia. Al contrario, l'ipersecrezione porta a ipertiroidismo, caratterizzato da un aumento del metabolismo, perdita di peso e nervosismo. 
L'ormone della crescita, un altro prodotto della ghiandola pituitaria, regola la crescita e il metabolismo. L'iposecrezione di questo ormone nei bambini porta ad un ritardo della crescita e a bassa statura, mentre l'ipersecrezione può causare gigantismo o acromegalia, dove le ossa aumentano di dimensioni in modo anomalo.

L'insulina e il glucagone, secreti dal pancreas, lavorano insieme per controllare i livelli di glucosio nel sangue. La carenza o la resistenza all'insulina provoca il diabete mellito, caratterizzato da alti livelli di zucchero nel sangue, mentre un eccesso di insulina porta all'ipoglicemia, portando a rischi di sviluppare danni cerebrali e convulsioni.

L'ormone pineale, comunemente noto come melatonina, è prodotto dalla ghiandola pineale, una piccola ghiandola endocrina situata vicino al centro del cervello. La melatonina è fondamentale nella regolazione dei ritmi circadiani del corpo, influenza i cicli sonno-veglia e i ritmi biologici stagionali. È anche coinvolta in varie funzioni biologiche, tra cui la modulazione dell'umore e delle prestazioni del sistema immunitario. L'iposecrezione di melatonina può portare a disturbi del sonno, come l'insonnia, può contribuire ai sintomi del disturbo affettivo stagionale (SAD) e ad alcuni tipi di depressione. Al contrario, l'ipersecrezione di melatonina è meno comune ma può causare eccessiva sonnolenza e interruzione del ritmo circadiano, potenzialmente influenzando le funzioni cognitive e la stabilità dell'umore. Entrambe le condizioni evidenziano l'importanza dell’avere livelli di melatonina bilanciati per mantenere una salute ottimale.

I principali ormoni e loro funzioni

Gli ormoni sono i messaggeri chimici che coordinano i processi complessi nel corpo.
L'ossitocina è sintetizzata nell'ipotalamo e secreta dal ...

Education

Didattica

JoVE Core

Introduction to Psychology

Introduzione alla psicologia

Unit 1

Unità 1

Biopsychology

Biopsicologia

KEY TERMS AND CONCEPTS

TERMINI E CONCETTI CHIAVE

Major Hormones and Their Functions

hormone imbalances and their effects

Hormones are chemical messengers made by endocrine glands. They help control body functions and keep internal conditions stable. When hormone levels shift too far up or down, normal body processes can be disrupted.

Several major hormones have clear roles in the body. Oxytocin is made in the hypothalamus and released by the pituitary gland. It supports social bonding, childbirth, and lactation. Low oxytocin can affect social interaction and stress response, and it may contribute to depression. High levels are less common, but they can intensify childbirth contractions or cause a strong milk ejection reflex during breastfeeding.

Cortisol and epinephrine are secreted by the adrenal glands and help the body respond to stress. Cortisol also helps regulate metabolism and immune responses. Too little cortisol can cause Addison's disease, with fatigue and muscle weakness. Too much cortisol can lead to Cushing's syndrome, which is linked to obesity, hypertension, and high blood sugar. Epinephrine raises heart rate and energy production during stress. Low epinephrine can weaken the stress response in acute danger, while high levels may cause chronic anxiety and cardiac distress.

Estrogen and testosterone are sex hormones with wider effects beyond reproduction. Estrogen is mainly produced by the ovaries and supports the menstrual cycle, bone density, and cholesterol levels. Low estrogen can cause menstrual irregularities and raise the risk of osteoporosis because bone density drops. High estrogen is linked with a higher risk of breast and uterine cancers. Testosterone is mainly produced by the testes and supports male reproductive tissues, muscle mass, bone mass, and body hair growth. Low testosterone can reduce muscle mass, impair sexual function, lower bone density, and affect mood. High testosterone may be linked to prostate enlargement, increased aggression, and mood changes.

Thyroxine, growth hormone, insulin, glucagon, and melatonin also play key roles. The thyroid gland in the neck secretes thyroxine, which controls metabolism, growth, and development. Too little thyroxine slows metabolism and can cause hypothyroidism, weight gain, and lethargy. Too much causes hyperthyroidism, with weight loss and nervousness. Growth hormone from the pituitary gland helps regulate growth and metabolism. Low levels in children can cause growth failure and short stature, while high levels can lead to gigantism or acromegaly, where bones grow abnormally large.

The pancreas secretes insulin and glucagon to manage blood glucose. Insulin deficiency or resistance can cause diabetes mellitus, a condition marked by high blood sugar. Too much insulin can cause hypoglycemia, which may lead to brain damage and seizures. The pineal gland makes melatonin, which helps regulate circadian rhythms, including sleep-wake cycles and seasonal patterns. Melatonin also affects mood and immune system performance. Low melatonin can contribute to insomnia, seasonal affective disorder, and some types of depression. High melatonin is less common, but it can cause excessive sleepiness, disrupt circadian rhythm, and affect cognition and mood stability.

Hormone Imbalances and Their Effects

introduction to biological bases of psychology

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Biological Factors Shaping Behavior and Mind

Biopsychology connects biology and psychology by showing how the body influences behavior and mental processes. It focuses on the nervous system, neurotransmitters, hormones, genetics, and evolutionary ideas. Together, these areas help explain why people think, feel, and act the way they do. The nervous system is the main foundation of biopsychology. It has two parts: the central nervous system, or CNS, and the peripheral nervous system, or PNS. The CNS includes the brain and spinal cord and...

nervous system

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The nervous system helps the body sense, move, and respond. It works through a network of nerve cells that carry signals around the body. This system has two main parts: the central nervous system and the peripheral nervous system. The central nervous system, or CNS, includes the brain and spinal cord. The brain acts as the body’s control center. It processes sensory information and helps coordinate responses. The spinal cord serves as a major pathway for signals between the brain and the rest...

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Neuron Parts and Signal Transmission

Neurons are the cells that carry information through the brain and nervous system. They use electrical and chemical signals to help control body functions, from heartbeat regulation to complex thinking. Their structure is built for fast, efficient communication. The cell body, or soma, is the neuron’s control center. It contains the nucleus, which holds the cell’s genetic material and helps maintain the neuron’s health and function. The cytoplasm around it contains organelles that make...

neuronal communication

How Neurons Send Signals

Neurons send signals through electrochemical communication that supports brain and nervous system function. A key part of this process is the action potential, a rapid electrical change that starts when the neuron’s internal charge rises above a threshold. That signal then travels along the axon to the axon terminal, where it is ready to pass to another neuron. The connection point between two neurons is called a synapse. Synapses can be electrical or chemical, and each type moves information...

neurotransmitters

Brain Chemicals That Shape Mood and Movement

Neurotransmitters are chemical messengers that help neurons communicate. They play a major role in nervous system function, as well as in mood, movement, sleep, and social behavior. Serotonin is made in the brain and intestines. It is linked to well-being and happiness, and it helps regulate mood, appetite, and sleep. When serotonin levels are out of balance in the brain or in peripheral sites, depression and sleep problems can occur. Dopamine is produced in several brain areas, including the...

cerebral hemispheres

How the Brain’s Two Halves Work

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lobes of the cerebrum

How Brain Lobes Shape Perception

The cerebral cortex is divided into two hemispheres, and each hemisphere has four lobes: frontal, parietal, temporal, and occipital. Together, these lobes support the brain’s main cognitive and sensory jobs. They work as a team to help you think, feel, move, and respond to the world. The frontal lobe sits behind the forehead and acts as a control center for personality, intelligence, and voluntary muscle movement. It also contains the prefrontal cortex, a region that helps with planning,...

spinal cord

Spinal Cord Nerves and Reflexes

The spinal cord is a major part of the central nervous system. It runs from the base of the brainstem to the lumbar region of the vertebral column. It helps keep the body stable and carries signals between the brain and the rest of the body. The spinal cord sits inside the bony spine for protection. It is divided into 30 segments that match the vertebrae. Each segment connects to a specific body region through paired spinal nerves. These spinal nerves are grouped by where they leave the...

lateralization

Brain Hemisphere Specialization

Brain hemisphere specialization divides mental tasks between the left and right sides of the brain. This split can improve neural efficiency and support more complex human abilities. Each hemisphere tends to handle the work it does best, which helps cognitive processing run more smoothly. The left hemisphere is especially strong in logic and language-related tasks. It supports analytical thinking, which means breaking a problem into parts and solving it step by step. This is important for...

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Chromosomes, DNA, and Inherited Traits

Chromosomes, DNA, and inherited traits explain how genetic information is organized in the human body. Each cell contains a nucleus, and the nucleus holds 46 chromosomes arranged in 23 pairs. These chromosomes are tightly coiled structures made of DNA, which carries the instructions passed from parents to offspring. An individual inherits one set of chromosomes from the mother through the egg and one set from the father through the sperm. This combination creates a unique genetic makeup. Of...

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How Alleles Shape Inherited Traits

Genetic variation helps explain why individuals in the same species can look and act differently. It comes from differences in DNA sequences. This diversity matters because it helps a species survive and adapt when the environment changes. Variation starts at fertilization, when an egg and sperm cell join. Each of these cells carries 23 chromosomes, so the fertilized egg can have up to 46 chromosomes. Chromosomes are long DNA strands that contain genes, which are the basic units of heredity. <br...

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How Behavior Genetics Studies Inheritance

Behavior genetics studies how inherited genes influence human behavior. It looks at how genes passed from parents to offspring help shape behavioral traits and tendencies. The field also examines how inherited factors and environmental influences work together. Researchers use family studies, twin studies, and adoption studies to separate genetic and environmental effects. Family studies track traits within biological families to find possible genetic patterns. They have helped identify...

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Brain Regions and Their Key Functions

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neuroplasticity

How the Brain Rewires Itself

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brain imaging

Brain Scanning Techniques

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the endocrine system

Endocrine Glands and Hormone Signals

The endocrine system is a network of glands that send hormone signals through the body. Hormones are chemical messengers that help control many body functions. They enter the bloodstream and travel to cells with the right receptors, or target sites, so the signal can be received. Because of this, hormone effects are widespread, unlike the more localized effects of neurotransmitters. This signaling helps the body keep a stable internal environment, called homeostasis. Several major glands...

somatosensory, motor, and association cortex

somatosensory-motor-and-association-cortex

Brain Cortex Areas for Sensation and Movement

The brain cortex uses separate areas for sensation, movement, and higher thinking. The somatosensory cortex is in the parietal lobes. It helps the brain interpret touch, temperature, and proprioception, which is awareness of body position. The somatosensory cortex has an organized map of the body. Neurons at the top of this region mainly process signals from the lower body. Neurons at the bottom handle input from the upper body. This layout helps the brain locate sensory input with precision.

major hormones and their functions

Hormones are chemical messengers made by endocrine glands. They help control body functions and keep internal conditions stable. When hormone levels shift too far up or down, normal body processes can be disrupted. Several major hormones have clear roles in the body. Oxytocin is made in the hypothalamus and released by the pituitary gland. It supports social bonding, childbirth, and lactation. Low oxytocin can affect social interaction and stress response, and it may contribute to depression.

inheritance

Genes, Traits, and Mendel's Rules

Genes, traits, and Mendel's rules explain how characteristics pass from parents to offspring. Gregor Mendel's pea plant experiments changed how scientists understand heredity. His work showed that traits are controlled by discrete units inside organisms called genes. Genes usually come in pairs. One gene is inherited from each parent, and together they make a person's genotype. Genotype is the genetic blueprint for potential traits. Examples include blood type, eye color, and inherited...

gene-environment interactions

How Environment Shapes Gene Expression

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heritability

Heritability and the Environment

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natural selection and adaptation

Adaptation in Changing Environments

Natural selection explains how organisms become better suited to their environments over time. It favors individuals with traits that improve survival and reproduction. Adaptation is the result. It includes genetic changes that help an organism function in specific conditions, such as extreme cold or thinner air at high altitudes. Adaptation is not only physical. Psychological adaptation also helps organisms, especially humans, succeed in their surroundings. These responses come from both...

natural selection and mating preferences

How Selection Shapes Mate Choice

Natural selection and mating preferences work together to shape how organisms survive and reproduce. Natural selection favors traits that help an organism fit its environment. Mating preferences are part of sexual selection, which influences who mates with whom and how genes are passed on. Evolutionary psychologists argue that these preferences are tied to instincts that support reproduction. For females, conception, pregnancy, and nursing create a strong need to choose mates who can offer...

criticisms of the evolutionary perspective

criticisms-of-the-evolutionary-perspective

Social Learning vs. Evolutionary Psychology

Social learning theory and evolutionary psychology offer two different ways to explain sexual behavior. A study in which strangers gave students compliments and then asked for casual sex showed a clear gender gap. None of the women said yes, while 70% of the men agreed. Evolutionary psychology explains this result by arguing that natural selection may have shaped women to be more selective about sexual partners. From this view, selectivity can help improve survival and reproductive success. It...

key terms and concepts

Explore major hormones, including cortisol, estrogen, insulin, and melatonin, and see how too much or too little can affect growth, stress, sleep, and blood sugar.

Hormone Imbalances and Their Effects | JoVE K12

JoVE Core Introduction to Psychology offers an engaging learning experience on the fundamental principles of psychology through concise video lessons. Students will explore important topics such as cognitive processes, emotional regulation, and neural mechanisms, establishing a strong foundation in the study of the mind and human behavior. This series provides an accessible and captivating approach to grasp the essential concepts of the discipline.

introduction to psychology

Hormone Imbalances and Their Effects

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