Which one of the following is NOT a modification designed to increase surface area for absorption within the small intestine?
A) microvilli
B) villi
C) Peyer's patches
D) circular folds
E) plicae circulares
C
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To reduce brain swelling by pulling water out of brain cells, a substance can be injected intravenously to increase the osmotic pressure of interstitial fluid. Which of the following properties must this substance lack in order to be effective?
A) permeable to capillary endothelium B) nontoxic to neurons C) permeable to brain plasma membranes D) impermeable to brain plasma membranes E) soluble in water
Which of the following is a morphine-like neurotransmitter that acts as a natural pain killer?
a. endorphin b. acetylcholine c. dopamine d. epinephrine
An increase in a membranes permeability to K+ will result in _____ of the membrane.
Fill in the blank(s) with the appropriate word(s).
Which stimulates the secretion of growth hormone?
A. waking from sleep B. exercise C. increased levels of IGF-I in blood D. high plasma glucose E. increased somatostatin secretion