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In fetal circulation, blood bypasses the lungs by flowing through the

A.

ductus venosus and ductus arteriosus

B.

foramen ovale and ductus arteriosus

C.

fossa ovalis and umbilical arteries and vein

D.

ligamentum venosum and ligamentum arteriosum

Answer and Explanation

The Correct Answer is B

A. Ductus venosus and ductus arteriosus: The ductus venosus bypasses the liver, not the lungs. The ductus arteriosus does allow blood to bypass the lungs by connecting the pulmonary artery to the aorta. However, this option is not entirely correct since the ductus venosus is not involved in bypassing the lungs.

 

B. Foramen ovale and ductus arteriosus: The foramen ovale allows blood to pass directly from the right atrium to the left atrium, bypassing the lungs. The ductus arteriosus connects the pulmonary artery to the aorta, also bypassing the lungs. 

 

C. Fossa ovalis and umbilical arteries and vein: The fossa ovalis is a remnant of the foramen ovale in adults and does not function in fetal circulation. The umbilical arteries and vein are involved in exchanging oxygenated and deoxygenated blood between the fetus and placenta, not bypassing the lungs.

 

D. Ligamentum venosum and ligamentum arteriosum: These are the adult remnants of the ductus venosus and ductus arteriosus, respectively. They do not play a role in fetal circulat


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View Related questions

Correct Answer is B

Explanation

A. Pyelitis is an infection of the renal pelvis and does not cause sweet-smelling urine.

B. Diabetes mellitus often causes glycosuria (glucose in urine), which can make urine taste sweet.

C. Renal calculus (kidney stones) does not affect urine sweetness.

D. Acute glomerulonephritis affects kidney function and urine appearance but does not specifically cause sweet-smelling urine.

Correct Answer is B

Explanation

A. Aerobic respiration; anaerobic fermentation: Aerobic respiration primarily occurs in the mitochondrion, and anaerobic fermentation occurs in the cytoplasm. Therefore, this is incorrect.

B. Glycolysis; the citric acid (Krebs) cycle: Glycolysis occurs in the cytoplasm, breaking down glucose into pyruvate. The citric acid (Krebs) cycle takes place in the mitochondrion, where it further processes pyruvate for energy production.

C. The citric acid (Krebs) cycle; mitochondrial electron-transport: Both the citric acid cycle and the mitochondrial electron transport chain occur in the mitochondrion.

D. Anaerobic fermentation; glycolysis: Glycolysis occurs in the cytoplasm and is the first step in both aerobic and anaerobic pathways, but anaerobic fermentation also occurs in the cytoplasm, so this option is not accurate in distinguishing between processes happening in different locations.

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