How do proprioceptors contribute to the regulation of heart function?
They detect changes in position and movement during physical activity
They monitor blood pressure in the arteries
They detect chemical changes in the blood
They monitor heart rate directly
The Correct Answer is A
A. They detect changes in position and movement during physical activity: Proprioceptors are sensory receptors located in muscles, tendons, and joints that detect body position, stretch, and movement. During physical activity, they provide the cardiovascular control centers in the medulla oblongata with information about muscle activity. This contributes to increases in heart rate and cardiac output, helping to meet the metabolic demands of exercising tissues.
B. They monitor blood pressure in the arteries: Blood pressure is monitored by baroreceptors, not proprioceptors. Baroreceptors, located in the carotid sinus and aortic arch, detect changes in arterial wall stretch and send signals to the cardiovascular centers to adjust heart rate, stroke volume, and vascular tone accordingly.
C. They detect chemical changes in the blood: Chemoreceptors, such as those in the carotid and aortic bodies, sense changes in oxygen, carbon dioxide, and pH levels in the blood. They modulate heart rate and respiratory activity, but this is a separate mechanism from proprioceptor input.
D. They monitor heart rate directly: Heart rate is regulated by autonomic input from the sympathetic and parasympathetic nervous systems, influenced by sensory information from baroreceptors, chemoreceptors, and proprioceptors indirectly. Proprioceptors do not directly monitor the heart rate itself.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is {"dropdown-group-1":"A"}
Explanation
Correct answer: Left coronary
The left coronary artery arises from the left side of the ascending aorta, just above the aortic valve, and quickly branches to supply the heart muscle. Its two main branches are the anterior interventricular artery (also called the left anterior descending artery), which runs along the interventricular groove supplying the anterior walls of both ventricles, and the circumflex artery, which curves around the left side of the heart to supply the lateral and posterior walls of the left ventricle and left atrium. This anatomical arrangement ensures that oxygen-rich blood from the aorta is delivered efficiently to the majority of the left heart myocardium.
Correct Answer is A
Explanation
A. Sympathetic stimulation releases norepinephrine (NE), which binds to beta-1 receptors, increasing heart rate: Sympathetic nerve fibers release norepinephrine, which binds to beta-1 adrenergic receptors on the sinoatrial node and ventricular myocardium. This increases the rate of depolarization in pacemaker cells, enhancing heart rate (positive chronotropy), and also increases contractility (positive inotropy), preparing the heart for increased cardiac output.
B. Parasympathetic stimulation releases norepinephrine (NE), which binds to beta-1 receptors, increasing heart rate: Parasympathetic fibers do not release norepinephrine; they release acetylcholine. Norepinephrine is specific to sympathetic innervation. Therefore, this description incorrectly attributes sympathetic neurotransmission to parasympathetic activity.
C. Sympathetic stimulation releases norepinephrine (NE), which binds to muscarinic receptors, slowing heart rate: Muscarinic receptors are activated by acetylcholine released from parasympathetic fibers, not by norepinephrine. Sympathetic stimulation increases heart rate, rather than slowing it, through beta-1 receptor activation.
D. Parasympathetic stimulation releases acetylcholine (ACh), which binds to the beta-1 receptors, increasing heart rate: Parasympathetic stimulation releases acetylcholine, but it binds to muscarinic receptors on pacemaker cells, not beta-1 adrenergic receptors. Activation of muscarinic receptors slows the heart rate (negative chronotropy) rather than increasing it.
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