Choose the event in the male reproductive process that does not involve the Sertoli cells.
A. Protection of developing sperm from the male's immune system
B. Production of testosterone
C. Production of androgen-binding protein
D. FSH stimulation of spermiogenesis
Answer: B
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Melanocytes can transfer granules of melanin into nearby epithelial cells.
Answer the following statement true (T) or false (F)
Smooth muscle cells can contract as a unit due to the presence of ___?
Fill in the blank(s) with the appropriate word(s).
The amount of a substance that is excreted in the urine is equal to the amount that is ________ plus the amount that is ________ minus the amount that is ________.
A. reabsorbed; secreted; filtered B. secreted; reabsorbed; filtered C. filtered; reabsorbed; secreted D. filtered; secreted; reabsorbed E. reabsorbed; filtered; secreted
The most complex respiratory system among vertebrates is found in
a. mammals. b. reptiles. c. birds. d. amphibians. e. fish.