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Which of the following heart valves separates the right atrium from the right ventricle?

A.

Pulmonic

B.

Tricuspid

C.

Aortic

D.

Mitral

Answer and Explanation

The Correct Answer is B

A. The pulmonic valve separates the right ventricle from the pulmonary artery, controlling blood flow to the lungs, not the right atrium from the right ventricle.
B. The tricuspid valve separates the right atrium from the right ventricle, allowing blood to flow from the atrium into the ventricle before it is pumped to the lungs.
C. The aortic valve separates the left ventricle from the aorta, controlling blood flow from the heart to the body, not between the atrium and ventricle.
D. The mitral valve separates the left atrium from the left ventricle, controlling blood flow in the left side of the heart.


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Related Questions

Correct Answer is B

Explanation

A. Excessive aldosterone causes increased reabsorption of sodium and water, and the excretion of potassium. Therefore, excessive aldosterone would typically decrease plasma potassium levels, not increase them.

B. Aldosterone stimulates the kidneys to reabsorb sodium and excrete potassium, leading to increased plasma sodium levels. This is the correct effect of excessive aldosterone secretion.

C. Phosphorus levels are not directly affected by aldosterone; its primary role is in regulating sodium and potassium balance.

D. Aldosterone does not directly regulate calcium levels in the blood, so plasma calcium levels are not significantly affected by aldosterone secretion.

Correct Answer is C

Explanation

A. GABA (gamma-aminobutyric acid) is an inhibitory neurotransmitter in the central nervous system, meaning it generally reduces neuronal excitability and does not play a role in excitatory neuromuscular transmission.
B. Glycine is also an inhibitory neurotransmitter, mainly in the spinal cord, and works to prevent over-excitation of neurons, not directly involved in neuromuscular transmission.
C. Acetylcholine is the primary neurotransmitter responsible for neuromuscular transmission. It binds to receptors on muscle cells, causing depolarization and triggering muscle contraction, thus playing an excitatory role.
D. Serotonin primarily functions in the brain to regulate mood, appetite, and sleep but does not play a direct role in neuromuscular transmission.

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