APPLIED RADIOLOGICAL ANATOMY

ANATOMY

CHEST AND CARDIOVASCULAR

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

Which of the following regulates and controls heart rate, vessel diameter, and ventricular systole based on the body’s needs?

A	baroreceptors
B	chemoreceptors
C	proprioceptors
D	medulla oblongata

Explanation:

Detailed explanation-1: -Answer and Explanation: The vital centers for heartbeat, respiration, and blood vessel diameter regulation are found in the d) medulla oblongata. The medulla oblongata is the most inferior portion of the brainstem and is responsible for autonomic functions and connecting the spinal cord to higher levels of the brain.

Detailed explanation-2: -Heart rate is controlled by the two branches of the autonomic (involuntary) nervous system. The sympathetic nervous system (SNS) and the parasympathetic nervous system (PNS). The sympathetic nervous system (SNS) releases the hormones (catecholamines-epinephrine and norepinephrine) to accelerate the heart rate.

Detailed explanation-3: -The cardiovascular center is a part of the human brain found in the medulla oblongata, responsible for regulation of cardiac output. Numerous receptors in the circulatory system can detect changes in pH or stretch and signal these changes to the cardiovascular center.

There is 1 question to complete.