Which choice describes the countercurrent mechanism of the nephron loop?
A) Water moves out of the ascending limb; sodium moves in the ascending limb
B) Water moves in the ascending limb; sodium moves out of the ascending limb
C) Water moves in the descending limb; sodium moves out of the descending limb
D) Water moves out of the descending limb; sodium moves out of the ascending limb
D
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The layer of connective tissue that surrounds a fascicle within a peripheral nerve is the
A) perineurium. B) epineurium. C) endoneurium. D) epimysium. E) endosteum.
Which of the following events occurs in an erection?
A. Vasoconstriction of arteries leading to erectile tissue of penis B. Engorgement of erectile tissue of penis with blood C. Relaxation of internal sphincter of urinary bladder D. Dilation of venules leading from erectile tissue of penis E. Decrease of blood flow to the penis
Eicosanoids are an important class of regulatory molecules; what chemical class do they belong to?
A. steroids B. proteins C. carbohydrates D. fatty acids E. amino acids
If sleep apnea is due to __________, it could involve temporary closure of any portion of the __________ airway.
A. airway obstruction; upper B. airway obstruction; lower C. neurological problems; lower D. neurological problems; upper