Depolarization of the oocyte plasma membrane occurs when the first sperm attaches to the integrin ?6?1. This is called the ________.
A. acrosomal reaction
B. fertilization
C. spermiogenesis
D. slow block to polyspermy
E. fast block to polyspermy
Answer: E
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Somatostatin functions in glucose homeostasis by
a. promoting reduced growth of the body, decreasing the need of individual cells for glucose, and thereby promoting glucose sparing. b. inhibiting digestion and absorption of nutrients, preventing hyperglycemia. c. inhibiting secretion of prolactin, reducing production of lactose for milk, and preventing hypoglycemia. d. doing all of these. e. doing none of these.
When you try to focus on the tip of your nose,
A. the tension on the suspensory ligament increases. B. the lens becomes more spherical. C. the pupils dilate. D. the lens becomes flatter. E. the ciliary muscles relax.
At the onset of exercise when the small ATP reserve in muscle fibers is quickly depleted, _____ occurs next.
A. direct phosphorylation of ADP
B. production of ATP by aerobic respiration
Explain the function of cytokines secreted by helper T cells
A) Cytokines secreted by helper T cells stimulate the innate immunity only. B) Cytokines secreted by helper T cells stimulate the cell-mediated adaptive immunity only. C) Cytokines secreted by helper T cells stimulate the antibody-mediated adaptive immunity only. D) Cytokines secreted by helper T cells stimulate the cell-mediated adaptive immunity and antibody-mediated adaptive immunity. E) Cytokines secreted by helper T cells stimulate NK cells only.