Name: how neurons send signals
Uploaded: 2024-08-29T22:13:36.000Z
Duration: 1 min 28 s
Channel: JoVE

K12 Standards

Florida Department of Education

High School

Life Science

SC.912.L.14

SC.912.L.14.24

Neuronal Communication

Neuronen kommunizieren, indem sie elektrochemische Signale senden, die entlang ihrer Axone an benachbarte Neuronen wandern.
Wenn die elektrische Ladung in einem Neuron eine bestimmte Schwelle überschreitet, löst sie ein Aktionspotential aus. Dieses elektrische Signal wandert das Axon hinunter zum Axonterminal, wo es über spezialisierte Strukturen, die als Synapsen bekannt sind, an das nächste Neuron übertragen wird.
Synapsen werden in zwei Haupttypen eingeteilt – elektrisch und chemisch.
Elektrische Synapsen weisen direkte Verbindungen zwischen Neuronen durch Gap Junctions auf. Dies ermöglicht den sofortigen und direkten Transfer von Ionen und erleichtert so die Impulsübertragung. Diese Art der synaptischen Übertragung ist sehr schnell und findet sich typischerweise in Bereichen des Gehirns, die eine schnelle Koordination erfordern.
Im Gegensatz dazu beinhalten chemische Synapsen die Freisetzung von Neurotransmittern, chemischen Botenstoffen, die durch den synaptischen Spalt zwischen Neuronen wandern.
Wenn ein elektrischer Impuls oder ein Aktionspotential das präsynaptische Neuron erreicht, löst er die Freisetzung von Neurotransmittern aus Vesikeln in den synaptischen Spalt aus.
Diese Neurotransmitter binden dann an Rezeptorproteine auf dem postsynaptischen Neuron und verursachen Veränderungen, die das Neuron entweder erregen oder hemmen können, abhängig von der Art des beteiligten Neurotransmitters und Rezeptors.

neuronale kommunikation

Neuronen, die grundlegenden Einheiten des Gehirns und des Nervensystems, kommunizieren durch komplexe elektrochemische Signale, die allen kognitiven und körperlichen Funktionen zugrunde liegen. Diese Kommunikation wird hauptsächlich durch einen Prozess ermöglicht, bei dem ein Aktionspotential entlang des Axons des Neurons erzeugt und weitergeleitet wird. Wenn die interne elektrische Ladung eines Neurons einen bestimmten Schwellenwert überschreitet, wird ein Aktionspotential ausgelöst. Diese schnelle Spannungsänderung wandert rasch entlang des Axons zum Axonende, wo es sich darauf vorbereitet, das Signal an ein benachbartes Neuron weiterzuleiten.

An der Synapse können der Verbindungspunkt zwischen zwei Neuronen und die Methode der Signalübertragung variieren. Synapsen werden grob in zwei Typen eingeteilt: elektrische und chemische.

Elektrische Synapsen

<ul style="list-style-type: disc; margin-left: 35px;">
	<li>Elektrische Synapsen mit ihren direkten Verbindungen, die durch Gap Junctions ermöglicht werden, sind ein Wunder an Geschwindigkeit und Effizienz.</li>
	<li>Diese Verbindungen ermöglichen den direkten Durchgang von Ionen zwischen Zellen, wodurch die Übertragung von Impulsen nahezu augenblicklich erfolgt.</li>
	<li>Diese Schnelligkeit ist in den Teilen des Gehirns, die eine schnelle Koordination erfordern, entscheidend, wie etwa in denen, die Reflexe und lebenswichtige Überlebensfunktionen steuern.</li>
</ul>

Chemische Synapsen

<ul style="list-style-type: disc; margin-left: 35px;">
	<li>Chemische Synapsen hingegen funktionieren über einen komplexeren Mechanismus, an dem Neurotransmitter beteiligt sind, also chemische Botenstoffe.</li>
	<li>Wenn das Aktionspotential das terminale Ende des präsynaptischen Neurons erreicht, löst es die Freisetzung dieser Neurotransmitter aus Vesikeln aus.</li>
	<li>Diese durchqueren dann den synaptischen Spalt – den kleinen Raum zwischen den kommunizierenden Neuronen – und binden an spezifische Rezeptorproteine, die sich auf der Oberfläche des postsynaptischen Neurons befinden.</li>
	<li>Die Bindung von Neurotransmittern an ihre Rezeptoren löst im postsynaptischen Neuron verschiedene Reaktionen aus.</li>
	<li>Diese Reaktionen können das Neuron entweder erregen oder hemmen, je nach Art des Neurotransmitters und des Rezeptors, den er aktiviert.</li>
	<li>Diese Modulation ermöglicht es dem Nervensystem, eine Reihe von Funktionen auszuführen, von der einfachen Muskelkontraktion bis hin zu komplexen Verhaltensweisen und emotionalen Reaktionen.</li>
	<li>Die Vielseitigkeit und Spezifität dieser chemischen Interaktionen ermöglichen es dem Gehirn, große Mengen an Informationen zu verarbeiten, körperliche Prozesse zu regulieren und sich an neue Erfahrungen anzupassen, was die enorme Komplexität und Eleganz neuronaler Kommunikationssysteme unterstreicht.</li>
</ul>

Neuronale Kommunikation

Neuronen kommunizieren, indem sie elektrochemische Signale senden, die entlang ihrer Axone an benachbarte Neuronen wandern.
Wenn die elektrische Ladung in einem Neuron ...

Education

Lehre

JoVE Core

Introduction to Psychology

Einführung in die Psychologie

Unit 1

Einheit 1

Biopsychology

Biopsychologie

KEY TERMS AND CONCEPTS

SCHLÜSSELBEGRIFFE UND KONZEPTE

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 in a different way. Electrical synapses use gap junctions, which are direct links that let ions move between cells. This makes signal transfer almost instantaneous and is useful in brain regions that need very fast coordination, such as reflex pathways and other survival functions.

Chemical synapses use neurotransmitters, which are chemical messengers. When the action potential reaches the presynaptic neuron’s terminal end, neurotransmitters are released from vesicles. They cross the synaptic cleft, the small gap between neurons, and bind to receptor proteins on the postsynaptic neuron. This binding can excite or inhibit the receiving neuron, depending on the neurotransmitter and receptor involved.

These chemical signals help the nervous system carry out many tasks. They support simple muscle contraction, as well as complex behaviors and emotional responses. Their flexibility and specificity also help the brain process large amounts of information, regulate body processes, and adapt to new experiences.

How Neurons Send Signals

introduction to biological bases of psychology

introduction-to-biological-bases-of-psychology

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

Nervous System: CNS, PNS, and Reflexes

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...

neurons as communicators of the brain

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

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

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The brain’s two cerebral hemispheres work together to process information and control the body. The left and right hemispheres are linked by the corpus callosum, a large bundle of nerve fibers. This connection lets the two sides share sensory and motor information, with each hemisphere controlling the opposite side of the body. The hemispheres are also specialized for different tasks. This is called lateralization, which means certain functions are handled more strongly by one side than the...

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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...

human genetics

Genes, Behavior, and Mental Health

Human genetics explains how genes can influence behavior, emotions, and mental health. It also shows how a person’s genetic code can shape physical traits and the risk of disease. Each individual carries a unique set of genes, so the effects can be subtle or more noticeable. Genes help direct how the brain, hormones, and cells work. These body systems are all shaped by genetic instructions, and they help produce differences in thoughts and behavior. Human genetics therefore links biology with...

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Chromosomes, DNA, and Inherited Traits

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genetic variation

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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...

organization of the brain

Brain Regions and Their Key Functions

The brain is the main control center of the nervous system. It processes sensory input, makes decisions, and directs body actions. Its structure is divided into the hindbrain, midbrain, and forebrain, and each part supports important functions. The hindbrain sits at the base of the brain. It helps regulate automatic life processes. The medulla oblongata controls involuntary functions such as heartbeat, breathing, and blood pressure. Nearby, the pons acts as a bridge between brain regions,...

evolutionary psychology

Evolutionary Psychology and Human Behavior

Evolutionary psychology explains human behavior and mental processes through natural selection. It uses Darwin’s idea that traits can spread when they help survival and reproduction. In this view, some common behaviors may be adaptations that were useful to our ancestors. One clear example is fear of snakes. This fear is nearly universal, which suggests that early humans who avoided snakes were more likely to survive deadly encounters. Over many generations, that caution could be passed on and...

neuroplasticity

How the Brain Rewires Itself

Neuroplasticity is the brain’s ability to change its structure and function in response to learning, experience, or injury. It allows neural circuits to reorganize over time. This flexibility supports lifelong development and adaptation. One part of this change begins when dendrites and axons grow. Dendrites receive signals, and axons send them. As they grow, the brain’s circuitry becomes more complex and can support more connections. Next, synaptogenesis occurs. Synaptogenesis is the...

brain imaging

Brain Scanning Techniques

Brain scanning techniques help scientists and doctors see the structure and activity of the human brain. These methods support the diagnosis, study, and treatment of neurological and psychiatric disorders. The main techniques include computerized axial tomography, or CT, positron-emission tomography, or PET, magnetic resonance imaging, or MRI, functional magnetic resonance imaging, or fMRI, and transcranial magnetic stimulation, or TMS. CT scans use X-ray technology to build detailed...

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...

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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

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.

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

Environmental factors can change how genes are expressed. Gene expression is a dynamic process, and traits can differ even in people with the same DNA. Radiation, temperature, behavior, nutrition, and stress all help shape the final outcome. The reaction range helps explain this process. It means genes set a possible range for a trait, while the environment helps decide where a person falls within that range. For example, genetics may allow a height range from 5'5" to 6'1", but nutrition,...

heritability

Heritability and the Environment

Heritability describes how genetic differences contribute to trait variation in a population. It is a statistical measure, so it shows how much of the spread in a trait can be linked to genes across a group. It does not tell you how “genetic” a trait is in an individual person. Heritability is usually expressed as a percentage. That percentage can change depending on which population is studied and what environmental conditions are present. This means heritability is context-dependent, not...

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

Learn how action potentials travel along axons and how electrical and chemical synapses pass signals between neurons in the nervous system.

How Neurons Send Signals | 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

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SC.912.L.14.4

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How Neurons Send Signals

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