The onset of puberty is triggered by an increase in:
A. sensitivity of the gonads to pituitary gonadotropins.
B. sensitivity of the pituitary to GnRH.
C. GnRH secretion.
D. sensitivity of the hypothalamus to negative feedback by sex steroids.
E. sensitivity of the pituitary to negative feedback by sex steroids.
C
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Which of the following is not a function of the spleen?
a. salvages iron from hemoglobin b. acts as a reservoir for blood c. is a site for the maturation of T cells d. destroys worn out red blood cells
Which factor would reduce total peripheral resistance?
a. adrenal medulla hormones b. angiotensin II c. red blood cell concentration d. anaphylactic shock e. cardiovascular center activity
The ABO blood group is based on which antigen(s)?
A) antigen Rh B) antigens A and B C) antigen O D) antigen D
Brunner's glands are mucus-type glands characteristically found in the:
a. Duodenum b. Esophagus c. Ileum d. Jejunum e. Stomach