Which Best Describes the Carotid Sinus Reflex

Which best describes the carotid sinus reflex. Chaddocks reflex in lesions of the pyramidal tract stimulation below the external malleolus causes extension of the great toe.

Solved 29 The Carotid Sinus Reflex Protects The Blood Chegg Com

Carotid sinus located at the base of the internal carotid artery contains baroreceptors involved in the control of blood pressure.

. Which best describes the carotid sinus reflex. Carotid sinus hypersensitivity CSH consists of the observation that stimulation of the carotid artery baroreceptors results in a greater than expected fall in heart rate and drop in blood pressure. Relief of carotid sinus syndrome by intracranial section of the glossopharyngeal nerve.

A All carry oxygenated blood to the heart. A carotid massage often called a carotid sinus massage or CSM is a medical maneuver used to slow down a dangerously rapid heartbeat in patients or to diagnose certain heart rhythm disturbances. A hypersensitive carotid sinus reflex is defined by a slowing in heart rate of more than 50 percent or a decline in systolic pressure by more than 40 mmHg during carotid sinus massage.

83 However less than 50 percent of patients with carotid hypersensitivity have syncope as a result. The carotid sinus has two types of fibers for transmission of vasculature status. Conversely in many patients with syncope of unidentifiable cause the carotid sinus syndrome.

14269703 Indexed for MEDLINE MeSH terms. See also carotid sinus syndrome. Carotid sinus syncope induced by malignant tumorsin the neck.

708 10 Vasodilation is a widening of the lumen due to smooth muscle contraction. Which best describes the carotid sinus reflex. This article has been viewed 61376 times.

Carotid sinus massage is a simple bedside maneuver that helps to clarify the type and sometimes also the mechanism of different rhythm disturbances. Parasympathetic activity increases when rising from a supine position. Sympathetic activity causes an increase in heart rated.

The carotid sinus anatomically is a small neurovascular structure located at the dilated portion of the common carotid artery the carotid bulb just at the point of its bifurcation. When sitting up from a supine position the carotid arteries. The baroreceptors in the carotid sinus and aortic arch are sensitive to.

Sympathetic activity causes an increase in heart rate when sitting up from a supine position. Sympathetic activity stimulates the vagus nerve to cause a decrease in heart rate. The carotid baroreceptors located bilaterally in the neck near the bifurcation of the internal and external carotid arteries play an important physiologic role in heart rate and blood pressure control.

3 Trout HH Brown LL Thompson JE. The carotid sinus extends from the bifurcation to the true internal carotid artery. What best describes the adaptive anatomy of the aorta.

Contains baroreceptors involved in the control of blood pressure. Carotid Sinus and Carotid Body. It contains baroreceptors which when stimulated cause slowing of the heart vasodilatation and a fall in blood pressure.

TF The carotid sinus reflex protects the blood supply to the brain whereas the aortic reflex is more concerned with maintaining adequate blood pressure in the systemic circuit as a whole. Called also Chaddocks sign. Carotid Sinus n 1.

Carotid sinus hypersensitivity CSH consists of the observation that stimulation of the carotid artery baroreceptors results in a greater. When sitting up from a supine position the carotid arteries. A hypersensitive carotid sinus reflex is defined by a slowing in heart rate of more than 50 percent or a decline in systolic pressure by more than 40 mmHg during carotid sinus massage.

The major indication for carotid sinus massage is the diagnosis of tachyarrhythmias in which the atrial activity is either absent or intermittently present. Sympathetic activity stimulates the vagus nerve to cause a decrease in heart rate when sitting up from a supine positionb. N Y State J Med.

It is not to be confused with the carotid body which is a PaO 2 PaCO 2 sensing chemoreceptor at the same location. Sympathetic activity causes an increase in heart rate when sitting up from a supine position. B All carry blood away from the heart.

29 The carotid sinus reflex protects the blood supply to the reflex is more concerned with maintind lex protects the blood supply to the brain whereas the aortic hood pressure in the systemico as a whole. 9 The carotid sinus reflex protects the blood supply to the brain whereas the aortic reflex is more concerned with maintaining adequate blood pressure in the systemic circuit as a whole. View the full answer.

The carotid sinus is sensitive to pressure changes in the arterial blood at this. In human anatomy the carotid sinus is a dilated area at the base of the internal carotid artery just superior to the bifurcation of the internal carotid and external carotid at the level of the superior border of thyroid cartilage. Conversely in many patients with syncope of unidentifiable cause the carotid sinus syndrome.

In such cases carotid baroreceptor stimulation eg mechanical forces such as may occur with turning of the neck or looking upward results in vagal activation andor. Carotid sinus reflex slowing of the heartbeat when pressure is applied to the carotid artery at the level of the cricoid cartilage. 2 Ray BS Stewart HJ.

Parasympathetic activity increases when rising from a supine positionc. Sympathetic activity causes an increase in heart rate. Sympathetic activity stimulates the vagus nerve.

Which of the following best describes the carotid sinus. Nervous control that operates via reflex arcs involving baroreceptors chemoreceptors and higher brain centers B the dural sinus reflex. The dilated portion of the common carotid artery at its bifurcation into external and internal carotids.

One study showed that the carotid baroreceptor reflex could regulate cerebral blood flow at rest and during dynamic exercise. Which best describes the carotid sinus reflex. Such carotid massage should be used cautiously however because the intense vagus-nerve-induced slowing of the cardiac rate could cause loss of consciousness as occurs in emotional fainting.

83 However less than 50 percent of patients with carotid hypersensitivity have syncope as a result. CAROTID SINUS REFLEX AS AN AID IN DIAGNOSIS. Role of the glossopharyngeal nerve in the carotid sinus reflex in man.

Sympathetic activity stimulates the vagus nerve to cause a decrease in heart rate when sitting up from a supine position. Which statement best describes arteries. Manual massage of the carotid sinus a procedure sometimes employed by physicians to reduce tachycardia and lower blood pressure also evokes this reflex.

Type 1 carotid baroreceptors also known as dynamic baroreceptors have large myelinated A-fibers. Carotid sinus massage is also useful in some patients with normal heart.

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