Which structure below secretes male sex hormone?
a. seminal vesicles.
b. prostate gland.
c. Sertoli cells.
d. bulbourethral glands.
e. interstitial cells.
E
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Heparin prevents blood clotting by
A. inhibiting the formation of prothrombin activator and the action of thrombin on fibrinogen. B. interfering with the formation of thrombin and fibrinogen. C. depleting the blood of platelets. D. binding to calcium ions.
When people experience conditions of high environmental temperatures and humidity,
A) they can become hydrated from absorbing water vapor from the air. B) their bodies are cooled primarily by the merocrine sweat glands. C) even if they do not overexert they will have sore muscles and feel tired. D) they feel increasingly energetic as their skin surface becomes warmer. E) None of the answers are correct.
A low red cell count could cause which of the following problems?
A) a reduced rate of diapedesis B) inefficient toxin removal from the tissues C) diminished transport of oxygen and carbon dioxide D) impaired immune response E) All of the answers are correct.
Mice that lack orexin have difficulty:
a. breathing at night. b. maintaining wakefulness. c. sleeping. d. waking up.