The first three rings of an atom should hold how many electrons?
-2 2 2
-2 2 8
-2 4 8
-2 8 18
-2 8 18
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The main force that causes filtration in a nephron is
A) blood colloid osmotic pressure. B) glomerular hydrostatic pressure. C) osmotic pressure of the urine. D) capsular hydrostatic pressure. E) reabsorption in proximal convoluted tubule pulls filtrate from blood.
What is the action of the muscle labeled C?
a) laterally flex and rotate head b) extends head c) depresses tongue d) protracts mandible (as in opening the mouth) e) elevates the mandible (as in closing the mouth)
The structure in the fetus that allows the blood to bypass the lungs is the:
a. ductus venosus b. ductus arteriosus c. foramen ovale d. both B and C above
Which of the following correctly describes an erection?
A. The spongy tissue in the penis fills with air. B. Smooth muscles of vascular spaces in the penis contract. C. Parasympathetic impulses constrict arteries leading to the penis. D. Parasympathetic neurons release nitric oxide causing dilation of small arteries in the penis.