The word "countercurrent" within "countercurrent multiplier" refers to the opposite direction of flow of
A. tubular fluid in the proximal convoluted tubule and collecting tubule.
B. salts and water across the wall of the renal tubule.
C. tubular fluid within the ascending and descending limb of the nephron loop.
D. sodium and potassium across the wall of the nephron.
Answer: C
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With presynaptic inhibition,
a. an IPSP occurs on the postsynaptic cell b. all excitatory information being fed into the cell is prevented c. the release of excitatory neurotransmitter from a specific presynaptic excitatory input is depressed. d. at least two of the above occur. e. none of the above occur.
Which of these is hydrophobic?
A. Glucose B. Water C. K+ D. Cl- E. Lipid
Blood cells and antibodies pass freely across the placenta.
Answer the following statement true (T) or false (F)
The subunit molecules for proteins are
A. fatty acids. B. nucleic acids. C. amino acids. D. monosaccharides.