The human testis contains many Leydig cells (interstitial cells) at various stages of differentiation, some of which have only half the normal number of chromosomes
Indicate whether the statement is true or false
F
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Which is NOT a function of Sertoli cells?
A. Secreting inhibin B. Phagocytizing defective sperm C. Nourishing developing sperm D. Forming a barrier between the blood and developing germ cells E. Converting estrogens into testosterone
Large proteins and red blood cells normally pass freely through the filtration membrane
Indicate whether this statement is true or false.
What is the function of the serous membranes?
What will be an ideal response?
In one kind of second-messenger system,
a. a small amount of one hormone (second messenger) is required to release another b. a tropic hormone (first messenger) stimulates secretion of another hormone (the second messenger) c. the hormone binds to a specific surface receptor, whereupon the hormone-receptor complex moves into the cell to combine with an intracellular receptor d. releasing hormones (first messenger) from the hypothalamus regulate anterior pituitary hormones (second messengers) e. a hormone (first messenger) binds to surface receptors that activate adenylate cyclase, which then catalyzes cAMP formation