The major factor controlling the onset of puberty in males is
A. a decrease in GnRH levels.
B. the production of testosterone by the testes.
C. the ability of the pituitary to secrete FSH and LH.
D. the hypothalamus becoming less sensitive to the inhibitory effects of androgens.
E. None of these choices is correct.
D
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The left suprarenal and gonadal veins differ from the right suprarenal and gonadal veins in how directly they get to the inferior vena cava
Indicate whether this statement is true or false.
The paraventricular nucleus of the hypothalamus secretes ________, which stimulates smooth muscle contraction in the uterus and prostate gland.
Fill in the blank(s) with the appropriate word(s).
Which of the following structures begins the process of digestion?
a. Stomach. b. Small intestine. c. Teeth. d. Esophagus.
The force responsible for normal expiration is supplied by the
A) diaphragm. B) contraction of smooth muscles in air passages. C) external intercostal muscles. D) elastic recoil of tissues and surface tension.