Sperm lack a(n) ________.
A. nucleus
B. mitochondria
C. endoplasmic reticulum
D. flagellum
Answer: C
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Which is not considered to be a symptom of menopause?
A. Periodic elevations in body temperature B. Increase in the amount of facial hair C. Vaginal dryness D. Osteoporosis E. No exceptions; all choices are considered to be symptoms of menopause.
John is a sprinter who specializes in quick and powerful bursts of speed followed by periods of rest. Jim is a marathon runner who specializes in long, steady runs. Compared to Jim, John is likely to have:
A. legs with a larger diameter. B. legs with a smaller diameter. C. hypertrophy of type I muscle fibers. D. a higher density of capillaries in his legs. E. lower concentrations of glycolytic enzymes in his leg muscles.
Erythropoietin is a hormone produced by the ________ to increase the rate of production and maturation of erythrocyte progenitor and erythroblast cells.
Fill in the blank(s) with the appropriate word(s).
What type of circuit is used to maintain body posture while walking?
A. Reverberating B. Converging C. Diverging D. Parallel-after-discharge E. None of the choices is correct.