Which of the following is TRUE about how water is handled by the nephron?
A. Water is actively secreted into the descending loop of Henle.
B. Vasopressin inserts pumps in the collecting duct membrane that move water against its concentration gradient.
C. Water is actively reabsorbed from the proximal tubule, and Na+ follows down its diffusion gradient.
D. Water is filtered out of glomerular capillaries by bulk flow.
E. The permeability of the ascending limb of the loop of Henle is modified by vasopressin.
Answer: D
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Formation of the neural tube
A. begins at the anterior (head) end and proceeds toward the posterior (tail). B. begins at the posterior and proceeds toward the anterior. C. is caused by compaction of the neural plate. D. begins in the middle and proceeds toward the head and the tail. E. is random in that it can begin and proceed at any location along the neural plate.
Which tissue forms a continuous sheet of cells with no blood vessels?
a. epithelial tissue b. connective tissue c. muscle tissue d. nervous tissue
Which term means toward or at the back of the body, behind?
A) anterior B) lateral C) distal D) dorsal
Individual cells of a ________ produce secretions.
Fill in the blank(s) with the appropriate word(s).