Which of the following statements regarding erection is false?
A) It involves parasympathetic stimulation.
B) Vascular channels in the erectile tissue become engorged with blood.
C) Dilation of penile arteries occurs.
D) It involves nitric oxide production by neurons.
E) It is commonly the result of plaque in the blood vessels of the penis.
E
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Fibrin, which is produced from the plasma protein ________, helps form blood clots.
Fill in the blank(s) with the appropriate word(s).
When ventricular pressure exceeds atrial pressure, the
A. ejection occurs. B. atria pump blood into the ventricles. C. ventricle is in diastole. D. blood is pumped into the atrium. E. AV valves close.
This figure illustrates epiphyseal plate morphology. Which is the zone of proliferating cartilage?
A. 1 B. 2 C. 3 D. 4 E. 5
The first episode of menstrual bleeding is called:
A) PMS. B) menarche. C) menopause. D) amenorrhea. E) female climacteric.