Name: how blood pressure is controlled
Uploaded: 2024-06-20T13:03:02.000Z
Duration: 1 min 30 s
Channel: JoVE

K12 Standards

Alabama Course of Study Science

9-12

Human Anatomy and Physiology

from-molecules-to-organisms-structures-and-processes

From Molecules to Organisms: Structures and Processes

9-12.HA.1.8.a

Blood Pressure

Blood pressure or BP is the pressure exerted by blood moving against the artery walls.
The average BP of an adult is 120 over 80 millimeters of mercury.
The numerator indicates systolic pressure, the force exerted on artery walls during ventricular contraction. The denominator signifies diastolic pressure, the pressure in arteries when the heart relaxes, and the ventricles refill with blood.
Several interconnected physiological processes regulate BP.
First is hormonal control. When BP decreases, the adrenal medullae release hormones such as adrenaline and noradrenaline, increasing cardiac output and contractility.
If BP rises, the atria secrete atrial natriuretic peptide hormone, which inhibits the renin-angiotensin system, causing vasodilation and lowering BP.
In neural control, the sympathetic nervous system promotes vasoconstriction and lowers BP when it is high. Conversely, the parasympathetic nervous system promotes vasodilation and decreases BP when it is high.
In renal control, the renin-angiotensin-aldosterone system activates when the kidneys detect low blood pressure. Renin converts angiotensinogen to angiotensin-I and angiotensin-II, which promotes vasoconstriction and a

blood pressure

Blood pressure (BP) is the pressure or force of blood exerted on the artery&#39;s walls as it circulates through the body. It is essential for maintaining blood flow throughout the body.
The average BP in an adult is typically around 120/80 mmHg (millimeters of mercury). In this measurement, the numerator (120) indicates the systolic pressure, which is the pressure in the arteries during the contraction of the heart&#39;s ventricles as blood is expelled. The denominator (80) represents the diastolic pressure in the arteries when the heart is at rest and the ventricles refill with blood.
BP regulation involves several interconnected physiological processes:
Hormonal Control: Hormones significantly influence BP regulation. When BP decreases, the adrenal medullae release adrenaline (epinephrine) and noradrenaline (norepinephrine). These hormones increase cardiac output (the volume of blood the heart pumps per minute) and contractility (the strength of the heart&#39;s contraction), thereby raising BP.
Neural Control: The autonomic nervous system, consisting of the sympathetic and parasympathetic systems, modulates BP. The sympathetic nervous system induces vasoconstriction (narrowing of blood vessels), increasing BP, often during stress or physical activity. Conversely, the parasympathetic system promotes vasodilation (widening blood vessels), decreasing BP during rest.
Renal Control: The kidneys also play a crucial role in BP regulation through the renin-angiotensin-aldosterone system (RAAS). When low BP is detected, the kidneys release renin, which converts angiotensinogen, a plasma protein, into angiotensin I. The lung&#39;s angiotensin-converting enzyme (ACE) converts angiotensin I to angiotensin II, a potent vasoconstrictor.
Additionally, angiotensin II stimulates aldosterone secretion from the adrenal cortex, promoting sodium and kidneys reabsorbing water and boosting blood volume and blood pressure.
Understanding these mechanisms is vital for clinical practice, especially in managing patients with hypertension or hypotension. Nurses regularly monitor BP and interpret the values to assess cardiovascular health, adjust medications, and provide appropriate care.

Blood pressure (BP) is the pressure or force of blood exerted on the artery&#39;s walls as it circulates through the body. It is essential for maintaining ...

Education

JoVE Core

Nursing

Unit 1

Vital Signs: Blood Pressure

KEY TERMS AND CONCEPTS

how blood pressure is controlled

Blood pressure is the force of blood against the walls of the arteries as it moves through the body. It helps keep blood flowing to tissues and organs. A typical adult reading is about 120/80 mmHg, or millimeters of mercury.

The two numbers in a blood pressure reading show different phases of the heartbeat. The systolic pressure, the top number, is the pressure in the arteries when the ventricles contract and push blood out. The diastolic pressure, the bottom number, is the pressure when the heart rests and the ventricles refill with blood.

Blood pressure is controlled by hormones, the nervous system, and the kidneys. When blood pressure falls, the adrenal medullae release adrenaline, also called epinephrine, and noradrenaline, also called norepinephrine. These hormones increase cardiac output, which is the amount of blood the heart pumps each minute, and they raise contractility, which is the strength of the heart's contraction.

The autonomic nervous system also helps regulate blood pressure. The sympathetic system causes vasoconstriction, or narrowing of blood vessels, which raises blood pressure during stress or physical activity. The parasympathetic system causes vasodilation, or widening of blood vessels, which lowers blood pressure during rest.

The kidneys control blood pressure through the renin-angiotensin-aldosterone system, or RAAS. When low blood pressure is detected, the kidneys release renin, which changes angiotensinogen into angiotensin I. An enzyme in the lungs, angiotensin-converting enzyme or ACE, changes angiotensin I into angiotensin II, a strong vasoconstrictor.

Angiotensin II also stimulates aldosterone release from the adrenal cortex. Aldosterone helps the kidneys reabsorb sodium and water, which increases blood volume and blood pressure. These control systems are important for understanding hypertension and hypotension, and nurses use blood pressure readings to check cardiovascular health, adjust medications, and guide patient care.

How Blood Pressure Is Controlled

Blood pressure is the force of blood against the walls of the arteries as it moves through the body. It helps keep blood flowing to tissues and organs. A typical adult reading is about 120/80 mmHg, or millimeters of mercury. The two numbers in a blood pressure reading show different phases of the heartbeat. The systolic pressure, the top number, is the pressure in the arteries when the ventricles contract and push blood out. The diastolic pressure, the bottom number, is the pressure when the...

factors affecting blood pressure

What Changes Blood Pressure Levels

Blood pressure levels change because of age, body position, daily rhythms, and everyday habits. These influences matter when reading blood pressure and when teaching patients how to manage it. Age is one important factor. As people get older, their arteries can become stiffer and lose elasticity. This makes it harder for the arteries to widen and absorb pressure changes, so systolic pressure often rises in older adults. Blood pressure also follows a circadian rhythm, which is the body’s...

alterations in blood pressure

Blood Pressure Patterns and Imbalances

Blood pressure patterns and imbalances include hypertension, or high blood pressure, and hypotension, or low blood pressure. Both conditions can affect how well blood moves through the body and can signal important health problems. Hypertension is present when blood pressure stays above the normal range. It is diagnosed when systolic pressure, the top number measured while the heart beats, is above 130 mmHg and diastolic pressure, the bottom number measured between beats, is above 80 mmHg on...

sites for measuring blood pressure

Brachial and Popliteal Blood Pressure Sites

Blood pressure is measured at specific artery sites to check cardiovascular health. The brachial artery and the popliteal artery are the two main sites used in this lesson because they are accessible and give reliable readings. The brachial artery is the standard site for non-invasive blood pressure monitoring, while the popliteal artery is used when the arm site cannot be accessed. The brachial artery starts from the axillary artery and runs to the cubital fossa at the front of the elbow. It...

equipments used to measure blood pressure

equipments-used-to-measure-blood-pressure

Blood Pressure Tools in Clinical Care

Blood pressure tools in clinical care include both direct and indirect methods. Some methods are invasive, while others are non-invasive. Each device gives blood pressure information in a different way. The direct method uses cannulation of a peripheral artery. During each cardiac contraction, pressure creates mechanical motion inside the catheter. This motion moves through rigid, fluid-filled tubing to a transducer, which changes it into electrical signals shown as waveforms on a monitor. An...

korotkoff sounds

Korotkoff Sounds During Blood Pressure Checks

Korotkoff sounds are the sounds heard during a blood pressure check with a sphygmomanometer. A stethoscope or a Doppler device is usually placed below the cuff to listen for them. These sounds were first described by Russian physician Nikolai Korotkov in 1905. Korotkoff sounds appear when the cuff pressure falls to the patient’s systolic blood pressure. Before that point, inflating the cuff about 30 millimeters of mercury above systolic pressure blocks blood flow, so no sounds are heard. As...

errors occurring during blood pressure monitoring

errors-occurring-during-blood-pressure-monitoring

Why Blood Pressure Readings Can Be Wrong

Blood pressure monitoring is an important clinical procedure for checking cardiovascular health. Accurate readings help doctors diagnose and manage heart and blood vessel conditions. But several factors can make the result falsely high or falsely low. Patient habits and body changes can affect the reading before the cuff is even used. A recent meal, caffeine, or smoking can raise blood pressure for a short time. Stress, physical strain, and natural daily rhythms, called circadian rhythms, can...

pre-procedural guidelines for assessing blood pressure

pre-procedural-guidelines-for-assessing-blood-pressure

Preparing for an Accurate Blood Pressure Check

Accurate blood pressure measurement starts with careful preparation. Standard pre-procedural steps help healthcare professionals get reliable readings and support patient safety. These steps also improve communication and the overall quality of care. Before starting, gather the needed equipment. This includes a stethoscope, a sphygmomanometer, a cuff that fits the arm, a pen, a flow sheet, and an alcohol swab. The cuff size matters. It should cover about 40% of the arm’s circumference at the...

assessment of blood pressure in brachial artery(one-step method)

assessment-of-blood-pressure-in-brachial-arteryone-step-method

Measuring Blood Pressure with a Digital Cuff

Measuring blood pressure with a digital cuff is a simple clinical procedure that uses an oscillometric sphygmomanometer. It focuses on accurate readings, patient safety, and comfort. The process also helps support reliable follow-up care. Before the measurement begins, hand hygiene is done to reduce cross-infection risk. The procedure is then explained to the patient so they know what to expect. This includes the brief length of the assessment and any sensations they may feel. Clear...

assessment of blood pressure in brachial artery(two-step method)

assessment-of-blood-pressure-in-brachial-arterytwo-step-method

Manual Brachial Blood Pressure Measurement

Manual blood pressure measurement in the brachial artery uses an aner​oid sphygmomanometer and a stethoscope to find systolic and diastolic pressure. This technique is a core clinical skill for checking blood pressure in people with hypertension or other cardiovascular conditions. The procedure begins with hand hygiene. This lowers the risk of cross-infection. The patient is then told what will happen. Clear explanation helps reduce anxiety and supports cooperation, which can affect the...

assessing blood pressure using a doppler ultrasound

assessing-blood-pressure-using-a-doppler-ultrasound

Doppler Ultrasound for Accurate Blood Pressure

Doppler ultrasound is used to measure blood pressure when a standard cuff method may not give an accurate reading. It uses high-frequency sound waves to detect blood flow in an artery. This makes it useful in clinical settings where circulation is harder to assess. Before the measurement, the care team prepares the Doppler device, a blood pressure cuff, a sphygmomanometer, and conducting gel. The cuff size must match the arm circumference and should cover about 40% of the limb. Different cuff...

assessing blood pressure in the leg

Measuring Leg Blood Pressure Step by Step

Measuring leg blood pressure takes careful setup, correct cuff placement, and close listening for clear readings. This procedure helps healthcare providers collect reliable vital signs and support patient care. The first step is hand hygiene. Use bactericidal soap or an alcohol-based rub to help reduce the spread of infectious agents. Then position the patient so the popliteal artery, the artery behind the knee, can be reached without obstruction. A prone position works best. If that is not...

special considerations while measuring blood pressure

special-considerations-while-measuring-blood-pressure

Common Blood Pressure Reading Pitfalls

Blood pressure readings can change because of body position, arm choice, sound quality, and the type of device used. Careful technique helps healthcare workers get the most accurate result and spot problems early. It is best to check blood pressure in both arms during the first assessment. The systolic value can differ by five to ten mm Hg between arms. For later checks, use the arm with the higher reading. Body position also matters. Diastolic pressure is about five millimeters of mercury...

key terms and concepts

Learn how hormones, the autonomic nervous system, and the kidneys control blood pressure, and how systolic and diastolic values are read.

How Blood Pressure Is Controlled | JoVE K12

JoVE Core Nursing offers concise animated lessons on nursing practices, covering health systems, nursing organizations, and health concepts. It includes practical communication, infection prevention, and nursing fundamentals, providing students with a clear understanding of nursing principles.

nursing

Florida Department of Education

High School

Life Science

SC.912.L.14

SC.912.L.14.39

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Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the ...

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How Blood Pressure Is Controlled

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