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What is the correct order of deoxygenated blood flow as it enters and then exits the heart?

A.

Enters the superior or interior vena cava; exits the pulmonary arteries

B.

Enters the aorta; exits the pulmonary veins

C.

Enters the superior or inferior vena cava; exits the coronary arteries

D.

Enters the pulmonary veins; exits the aorta

Answer and Explanation

The Correct Answer is A

A. Enters the superior or inferior vena cava; exits the pulmonary arteries: Deoxygenated blood from the body enters the heart through the superior or inferior vena cava and flows into the right atrium. It then passes into the right ventricle and exits through the pulmonary arteries to the lungs for oxygenation.

B. Enters the aorta; exits the pulmonary veins: The aorta and pulmonary veins both handle oxygenated blood, not deoxygenated blood, making this incorrect.

C. Enters the superior or inferior vena cava; exits the coronary arteries: The coronary arteries supply the heart muscle itself with oxygenated blood, so this is incorrect for deoxygenated blood.

D. Enters the pulmonary veins; exits the aorta: Both the pulmonary veins and the aorta are part of the oxygenated blood circuit, making this incorrect for deoxygenated blood flow.


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Related Questions

Correct Answer is B

Explanation

A. Increased surface tension: This would decrease ventilation as it increases the force needed to expand the lungs.

B. Increased lung compliance: Compliance refers to how easily the lungs can expand. Increased compliance makes it easier for the lungs to inflate, thereby increasing ventilation.

C. Fewer alveolar sacs: Having fewer alveolar sacs reduces the surface area for gas exchange, which would likely reduce ventilation efficiency.

D. More airway resistance: Increased airway resistance makes it harder to breathe, so it would reduce ventilation rather than increase it.

Correct Answer is D

Explanation

A. Dendritic cells: Dendritic cells are antigen-presenting cells that originate from precursor cells in the bone marrow, but they do not differentiate from monocytes.

B. Bacterial cells: Bacterial cells are pathogens and do not differentiate into any immune cells.

C. Natural killer cells: Natural killer cells are a type of lymphocyte involved in the innate immune response but do not differentiate from monocytes.

D. Monocyte cells: Monocytes are a type of white blood cell that, upon migrating into tissues, differentiate into macrophages, which play a key role in phagocytosis and immune response.

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