Why does a skeletal muscle fiber have more than one nucleus?
A) During development, the plasmalemmas of newly formed muscle fibers disintegrate,
making many muscle cells into one.
B) During development, groups of embryonic cells fuse together to form a single muscle
fiber.
C) During development, the nucleus of each myoblast replicates several times.
D) During muscular activity, parts of each muscle fiber break down, and the remaining parts,
including their nuclei, fuse into new combination fibers.
E) All of the answers are correct.
B) During development, groups of embryonic cells fuse together to form a single muscle
fiber.
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Which occurs first?
A. Absolute refractory period B. Relative refractory period
Select the characteristics of slow-twitch muscle fibers. Check all that apply.
A. Few capillaries are present. B. These fibers are also known as white fibers. C. Myoglobin is present in high concentration D. Mitochondria are numerous in these fibers.
When multiple presynaptic neurons release neurotransmitter at various locations onto the postsynaptic neuron at the same time, this results in
A. suprathreshold hyperpolarization. B. several action potentials. C. spatial summation. D. temporal summation.
A man who has his prostate removed as a result of prostate cancer would ________
A) Have less viable sperm B) Experience a decrease in human chorionic gonadotropin hormone C) No longer be able to produce sperm D) Lose function of his vas deferens