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Which of the following veins of the body returns blood to the right atrium?

A.

Subclavian vein

B.

Pulmonary vein

C.

Inferior vena cava

D.

Umbilical vein

Answer and Explanation

The Correct Answer is C

A. Subclavian vein: Drains the upper limb and ultimately feeds into the brachiocephalic veins and superior vena cava, which return blood to the right atrium.
B. Pulmonary vein: Carries oxygenated blood from the lungs to the left atrium, not the right atrium.
C. Inferior vena cava: Returns deoxygenated blood from the lower body directly into the right atrium.
D. Umbilical vein: In fetal circulation this returns oxygenated blood from the placenta to the fetus (and becomes a ligament after birth), so it does not return blood to the postnatal right atrium.


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Related Questions

Correct Answer is C

Explanation

A. Antidiuretic Hormone (ADH): Promotes water reabsorption in the kidneys and concentrates urine, but it does not directly stimulate red blood cell production.
B. Renin: An enzyme released by the kidney that initiates the RAAS cascade to regulate blood pressure and sodium balance; it does not directly increase RBC production.
C. Erythropoietin (EPO): A hormone produced mainly by the kidneys that stimulates the bone marrow to increase red blood cell production in response to hypoxia.
D. Aldosterone: Increases sodium reabsorption and potassium excretion in the kidney; it does not directly drive erythropoiesis.

Correct Answer is B

Explanation

A. Athlete’s foot: Caused by dermatophyte fungi (tinea pedis), so this is a fungal infection rather than a bacterial one.
B. Gonorrhea: Caused by the bacterium Neisseria gonorrhoeae, so this example is bacterial.
C. HIV: Caused by the human immunodeficiency virus, making it a viral infection.
D. Tapeworm: A parasitic infection caused by a helminth (cestode), not a bacterium.

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