In fetal circulation, blood bypasses the lungs by flowing through the
ductus venosus and ductus arteriosus
foramen ovale and ductus arteriosus
fossa ovalis and umbilical arteries and vein
ligamentum venosum and ligamentum arteriosum
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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Correct Answer is B
Explanation
A. It stimulates angiotensin II secretion: Antidiuretic hormone (ADH) does not directly stimulate angiotensin II secretion; instead, it acts on the kidneys to promote water reabsorption.
B. It promotes water conservation: ADH promotes water conservation by increasing water reabsorption in the kidneys, reducing urine output, and thus helping to maintain fluid balance.
C. It inhibits salivation and thirst: ADH does not inhibit salivation or thirst; in fact, it can increase thirst to encourage fluid intake when dehydration is detected.
D. It stimulates hypothalamic osmoreceptors: While ADH affects hypothalamic osmoreceptors indirectly by promoting water retention, its primary function is to act on the kidneys to conserve water.
Correct Answer is A
Explanation
A. Chief cells; hydrochloric acid (HCl); parietal cells: Pepsinogen is produced by chief cells, and it is activated into pepsin by hydrochloric acid (HCl) secreted by parietal cells.
B. Chief cells; carbonic anhydrase (CAH); parietal cells: Chief cells produce pepsinogen, but it is not activated by carbonic anhydrase. Instead, it is activated by HCl.
C. Parietal cells; carbonic anhydrase (CAH); chief cells: Pepsinogen is produced by chief cells, not parietal cells, and its activation involves HCl, not carbonic anhydrase.
D. Parietal cells; hydrochloric acid (HCl); chief cells: Pepsinogen is produced by chief cells, not parietal cells, and is activated by HCl.