The organelles that are rod-shaped structures made of fine tubes and are important in cell division are the:
a. ribosomes
b. mitochondria
c. Golgi apparatus
d. centrioles
d. centrioles
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Which of these terms best describes a sharp process?
A) Tuberosity B) Trochanter C) Epicondyle D) Spine
Upon the nerve impulse arriving at the axon terminal,
A) active sites on actin are exposed. B) active sites on myosin are exposed. C) actin heads will bind to myosin. D) muscle relaxation occurs. E) acetylcholine is released.
Otosclerosis affects the
A. cochlea. B. tympanic membrane. C. auditory ossicles. D. auditory nerve.
Which of the following does NOT correctly describe cardiac muscle cells?
A. They are arranged in layers surrounding hollow cavities in the heart. B. They are much shorter than skeletal muscle fibers, and generally have a single nucleus. C. Their membranes are depolarized initially by the influx of sodium ions. D. They depolarize prior to contraction. E. They can contract in the absence of external calcium.