After ovulation, the oocyte
A. waits passively for a sperm to penetrate.
B. releases negative ions that create an electrical gradient that all sperm swim toward.
C. releases chemotaxic signals to attract sperm to its location.
D. propels itself toward seminal fluid by calcium-dependent kinesis.
C
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Pronation is defined as
A) a rolling of the distal epiphysis of the radius over the ulna. B) a twisting of the ulna medially. C) twisting the forearm so that the palms face anteriorly. D) the shortening of the angle between the radius and the humerus. E) movement of the mandible anteriorly, as seen when biting the upper lip.
Which of the class(es) of hormones interacts with DNA?
a. proteins. b. catecholamines. c. steroids. d. amines e. both (a) and (b) above.
Which of the following structures contains enzymes that help a sperm to penetrate the cell membrane of an ovum?
a. Head b. Acrosome c. Neck d. Tail
Isolated areas of lymphoid follicles found in the intestinal mucosa are called ________.
A. lacteals B. Peyer's patches C. germinal centers D. Brunner's glands