When a skeletal muscle fiber contracts,
A) The H zones and I bands get smaller.
B) The zones of overlap get larger.
C) The Z lines get closer together.
D) The width of the A band gets constant.
E) all of the above
E) all of the above
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Cells of the intestine are very permeable to water while some cells of the kidney tubule are not at all permeable to water. Can you suggest some ways these two types of cells might be structurally different from each other?
What will be an ideal response?
What are the three muscles of the hamstrings
What will be an ideal response?
Urea is
A. completely reabsorbed by the nephron. B. diffuse out of the collecting ducts into the interstitial fluid of the medulla and then diffuse into the descending loop of Henle. C. secreted into the filtrate by cells of the distal convoluted tubule. D. actively transported into the filtrate by cells of the collecting duct. E. None of the choices are correct.
Water reabsorption by the renal tubules uses
A. active transport. B. cotransport. C. solvent drag. D. osmosis. E. None of these choices is correct.