An adaptation of the epithelial cells of the proximal convoluted tubule for reabsorption is
A) secreting enzymes that activate absorption of substances.
B) rugae folds that increase surface area.
C) microscopic projections called microvilli.
D) thin walls.
C
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The most effective regulator of blood pH is:
a. the buffer system b. the respiratory system c. the urinary system d. both B and C are equally effective
CNS adaptation is specific for a particular odor, and responsiveness to other odors remains unchanged
a. True b. False Indicate whether the statement is true or false
The duodenum, the jejunum, and the ileum are parts of which part organ?
A- liver B- small intestine C- large intestine D- stomach
How do most steroids differ from one another?
a) they differ in the functional groups attached to their backbone structure b) all the steroids are linear; however, some have ring-structured functional groups c) they differ in their basic backbone structure d) they differ in their solubility