Consider the two statements and use the following key to choose your answer.(1) Rate of muscle contraction when beta adrenergic receptors of the heart are stimulated(2) Rate of muscle contraction when beta adrenergic receptors of intestinal muscle are stimulated
A. Both items are equal or nearly equal.
B. First item is greater than the second item.
C. First item is less than the second item.
Answer: B
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Kyphosis is an excess curvature in the thoracic part of the vertebral column.
Answer the following statement true (T) or false (F)
The lipid bilayer is held together mainly by
a. covalent bonding between membrane lipids. b. hydrogen-bonding between the phospholipids' tails. c. repulsion between the phospholipids' tails and water. d. covalent bonding between the ends of phospholipids tails in opposite layers. e. hydrogen-bonding between the head groups of the phospholipids.
A retinal OFF-center bipolar cell:
A. depolarizes in response to a light in the center of its receptive field B. has metabotropic glutamate receptors that close Na+ channels C. depolarizes in response to a light in the periphery of its receptive field D. is hyperpolarized by horizontal cell input E. connects to ganglion cells but not horizontal cells
What type of adaptive immunity is a vaccine?
a. active natural b. active artificial c. passive natural d. passive artificial