Mechanoreceptors in High Pressure Sites

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Where are the baroreceptors located?

In the liver

In the kidneys

In blood vessels (correct)

In the brain

What determines Mean Arterial Pressure (MAP) according to the provided information?

Systolic pressure only

Pulse pressure alone

Diastolic pressure only

Diastolic pressure and 1/3 of pulse pressure (correct)

Which statement best describes the baroreflex system's role in blood pressure regulation?

It maintains blood pressure by adjusting vascular resistance and heart rate (correct)

It is primarily involved in regulating water reabsorption

It controls volume excretion in the kidneys

It is responsible for autonomic innervation of the heart

Can baroreceptors reset their sensing point?

Yes, they can adapt and alter their sensitivity Signup and view all the answers

In the context of the cardiovascular control centers in the brain, what is the main function of these centers?

Controlling cardiovascular functions like heart rate and blood vessel diameter Signup and view all the answers

What differentiates high pressure sites from low pressure sites regarding baroreceptors?

High pressure sites have more sensitive baroreceptors than low pressure sites Signup and view all the answers

What is the primary role of atrial natriuretic peptide (ANP) released from the atria?

Facilitate volume excretion (sodium and water) Signup and view all the answers

How do low-pressure baroreceptors respond to excessive venous return?

By eliminating fluid Signup and view all the answers

What effect does a sudden decrease in blood pressure have on the autonomic innervation of the cardiovascular system?

Inhibit parasympathetic nervous system (PNS) and stimulate sympathetic nervous system (SNS) Signup and view all the answers

What is the primary consequence of increased stretching of the walls of blood vessels on baroreceptor firing?

Increase baroreceptor firing rate Signup and view all the answers

How do cardiovascular baroreceptors respond to a sudden increase in blood pressure?

Decrease heart rate and blood pressure Signup and view all the answers

What is the function of preganglionic fibers in the autonomic innervation of the cardiovascular system?

Connect postganglionic fibers to target organs Signup and view all the answers

Which region of the brain serves as the integrative region of messages to regulate cardiovascular responses?

Hypothalamus Signup and view all the answers

What is the primary site of cardiovascular regulation in the brain?

Medulla Signup and view all the answers

Which cranial nerve is responsible for innervating the carotid sinus?

Glossopharyngeal nerve (cranial IX) Signup and view all the answers

Baroreceptors at the carotid sinus are more sensitive than those in the aortic arch in:

Animals Signup and view all the answers

Where do excitatory neurons from the Nucleus Tractus Solitarius (NTS) project to in the brain?

Rostral ventrolateral medulla (RVLM) Signup and view all the answers

What happens to the baroreceptor firing response curve with a sustained decrease in mean arterial pressure?

Shifts to the left Signup and view all the answers

What term is used to describe the shift in baroreceptor firing response curve with a sustained increase in mean arterial pressure?

Partial resetting Signup and view all the answers

What effect does chronic hypertension have on baroreceptor firing?

Increased baroreceptor firing Signup and view all the answers

What is the total range of pressure within which the carotid sinus baroreceptors respond?

60-180 mmHg Signup and view all the answers

Mechanoreceptors in High Pressure Sites - Medical Physiology

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