Sperm cannot fertilize an egg until they _________.
A) undergo capacitation.
B) undergo decapitation.
C) are in the vagina for 3 days.
D) lose their acrosome.
E) undergo activation.
A) undergo capacitation.
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Which is not correct regarding the perineum?
A. It includes the urogenital triangle and the anal triangle. B. It is circumscribed by the coccyx, ischial tuberosities, and pubic symphysis. C. It contains the urethral orifice in males. D. It contains the urethral and vaginal orifices in females. E. It is a diamond-shaped area between the thighs.
Low dosages of aspirin inhibit clotting by blocking the formation of which of the following?
A) vitamin K B) factor X C) factor VIII D) thrombin E) thromboxane A2
Which of the following constitutes the principal venous drainage of the thoracic organs?
A. The branches of the celiac trunk B. The azygos system C. The hepatic portal system D. The coronary and pulmonary veins E. The mesenteric circulation
Which function is responsible for maintaining equilibrium in the body?
a. Homeostasis. b. Feedback loop. c. Biorhythm. d. Brain functions.