The enzyme that harnesses the energy of H+ diffusion down its concentration gradient within a mitochondrion to make high-energy molecules for the cell is
A. ATP phosphatase.
B. ATP synthetase.
C. pyruvate decarboxylase.
D. succinic dehydrogenase.
E. creatine phosphatase.
B
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The structure of a testis can be described as composed of
A. about 250 lobules, each of which contains 1 to 4 seminiferous tubules. B. a single very long seminiferous tubule that winds through the structure. C. semen in various stages of development held in seminiferous tubules. D. 1 to 4 lobules, each of which contains about 250 seminiferous tubules.
Epithelial tissue tends to be richly innervated and highly regenerative.
Answer the following statement true (T) or false (F)
Smooth muscle contractions help to propel sperm in the
A. rete testis. B. ductus deferens. C. seminal receptacle. D. seminiferous tubule. E. ejaculatory duct.
Valves similar to the semilunar valves of the heart are found in medium and large ________.
A. venules B. arterioles C. capillaries D. arteries E. veins