Collectively, the yolk sac, chorion, amnion, and allantois are called the ________ membranes.
Fill in the blank(s) with the appropriate word(s).
extraembryonic
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Plasma membranes allow certain molecules to pass, while blocking others. Membranes with this property are called
A) impermeable. B) freely permeable. C) selectively permeable. D) actively permeable. E) nonpermeable.
The pituitary hormone that stimulates cell growth and replication by accelerating protein synthesis is
A) ACTH.
B) MSH.
C) prolactin.
D) insulin.
E) growth hormone.
In the citric acid cycle,
A. 4 ATP molecules are formed. B. carbon dioxide is released. C. oxygen atoms are released. D. hydrochloric acid is released.
The period of time in which the myocardium is insensitive to further stimulation is called the
A. absolute refractory period. B. hyperpolarization period. C. AV period. D. SA period. E. ectopic focus.