Which of the listed events occurs last?
A. Ovulation occurs.
B. Estrogen produced by theca interna cells increases.
C. FSH/LH positive-feedback loops produce a series of FSH/LH surges.
D. FSH and LH levels increase.
E. GnRH secretion is stimulated.
Answer: A
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Muscles that are used for precisely controlled movements generally contain large motor units
Indicate whether this statement is true or false.
The muscles that originate on the anterior surface of the pubic bone are
A) adductors of the thigh. B) medial rotators of the thigh. C) flexors of the thigh. D) extensors of the thigh. E) None of the answers are correct.
Protein catabolism is an impractical source of quick energy because
A) the major byproduct is hydrogen, which cells cannot use for energy. B) proteins are unimportant to cellular homeostasis. C) the body cannot synthesize any of the amino acids, which it needs. D) proteins are catabolized much too easily, resulting in homeostatic imbalance. E) proteins are more difficult to catabolize than are complex carbohydrates or lipids.
Which of the following statements about the trachea is false?
A) It ends in the mediastinum. B) It is reinforced with C-shaped cartilages. C) It is also called the windpipe. D) It alters its diameter in response to the autonomic nervous system. E) It is reinforced with D-shaped cartilages.