The contractile organelles of a skeletal muscle fiber are thread-like structures called
a) myofibrils.
b) myoglobin.
c) mitochondria.
d) Z discs.
e) M lines.
a
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These nuclei are located in the lateral horns and innervate smooth muscle, cardiac muscle, and glands.
A. Somatic sensory nuclei B. Sensory nuclei C. Somatic motor nuclei D. Visceral sensory nuclei E. Autonomic motor nuclei
Cell A is a gland cell that makes and secretes proteins. Cell B is another type of cell that synthesizes and secretes steroids. If you were to look at electron micrographs of the two cells, what differences would you expect to see?
A. The two cells would most likely look identical. B. Cell A would have fewer secretion granules than cell B. C. Cell B would have more granular endoplasmic reticulum than cell A. D. Cell A would have more granular endoplasmic reticulum than cell B. E. Cell A would have more agranular endoplasmic reticulum than cell B.
A muscle that assists the muscle that is primarily responsible for a given action is a(n)
A) agonist. B) antagonist. C) synergist. D) originator. E) levator.
The inferior vena cava brings blood from the lower regions of the body and empties into the
a. left atrium. b. right atrium. c. Aorta. d. left ventricle. e. right ventricle.