Why does elevated estrogen during the menstrual cycle typically promote follicle maturation, rather than follicular atresia, despite both processes using similar receptors?

💡 Explanation

Elevated estrogen levels during the menstrual cycle upregulate LH receptors on thecal cells; this is because, rather than a direct effect on the follicles, estrogen's primary effect is to stimulate LH receptor expression which supports further androgen production. Therefore, this positive feedback supports follicle maturation, rather than directly causing atresia.

• If a patient with a genetic defect in the complement system develops a bacterial infection, which immunological deficiency is most likely?
• If a marathon runner experiences a sharp decline in performance around mile 20, which consequence related to cellular metabolism most plausibly explains this 'hitting the wall' phenomenon?
• If an Olympic weightlifter experiences complete muscle failure during a lift, with an inability to maintain grip on the barbell, which consequence explains this failure mode?
• A patient with cirrhosis experiences a sudden drop in blood glucose levels. Which mechanism explains why the liver fails to maintain stable blood glucose despite glucagon stimulation?
• A patient with a hypothalamic lesion struggles to maintain a stable body temperature in varying ambient conditions. Which outcome most accurately explains why the body cannot thermoregulate effectively?
• After a bout of strep throat, a child develops acute rheumatic fever. Which mechanism explains this autoimmune response in the heart valves?