In humans, blood returning from the big toe passes from the inferior vena cava to the _______.
A. left atrium>left ventricle>aorta
B. left atrium>left ventricle>pulmonary trunk
C. right atrium>right ventricle>aorta
D. right atrium>right ventricle>pulmonary trunk
Answer: D. right atrium>right ventricle>pulmonary trunk
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An erectile tissue present in the penis but absent from the clitoris is
A. the corpus albicans. B. the tunica albuginea. C. the corpus spongiosum. D. the corpus cavernosum. E. the corpus luteum.
The dermis
A. does not contain connective tissue. B. is divided into three distinct layers. C. functions as padding and insulation. D. contains no blood vessels. E. is responsible for most of the skin's structural strength.
If a patient becomes dehydrated, the percentage of plasma in a centrifuged sample of his or her blood would likely
A. increase. B. not change. C. decrease.
Which is TRUE about hormonal control during pregnancy?
A. The corpus luteum must remain functional for 38 weeks, because it is the main source of estrogen and progesterone. B. The placenta responds to estrogen and progesterone from the corpus luteum, but does not secrete them. C. The placenta produces estrogen without any contribution from the fetal adrenal cortex. D. The placenta is provided with androgens by the maternal ovaries and adrenal glands, and by the fetal adrenal glands. E. The placenta secretes only steroid hormones, while fetal and maternal pituitary glands secrete pregnancy-specific protein hormones.