Spermatogenesis is regulated by ________.
A. progesterone
B. FSH
C. testosterone and its derivatives
D. growth hormone
Answer: C
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Which of the following is not true of the cytoskeleton?
A. It is important for cellular movement. B. It refers to the cellular components of bone. C. It refers to a network of cytoplasmic filaments. D. It helps to determine a cell's shape. E. It includes actin filaments.
The region surrounding the urethral opening, known as the neck of the urinary bladder, contains a muscular ________.
Fill in the blank(s) with the appropriate word(s).
Which cranial nerve is composed of only motor fibers?
A. V B. IX C. VI D. I E. VIII
Gap junctions are characteristic of which of the following?
A. Skeletal muscle B. Unitary smooth muscle C. Multiunit smooth muscle D. Neuromuscular junctions E. Tendon-bone connections