When a muscle atrophies,
a. the muscle fibers split lengthwise.
b. it decreases in mass and becomes weaker.
c. its fibers increase in diameter.
d. its fibers undergo mitotic cell division.
e. the muscle fibers dissolve and are replaced by fibrous scar tissue.
B
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A particular muscle causes flexion of the lower limb at the knee. It is located on the posterior side of the thigh. Where would you expect to find its antagonist?
A. On the lateral side of the thigh B. On any side of the thigh C. On the anterior side of the thigh D. On the posterior side of the thigh too E. On the medial side of the thigh
Choose the correct steps of the cell cycle that follow centriole replication.
G2 -> S -> M G2 -> M -> S S -> G2 -> M S -> M -> G2 M -> G2 -> S
Mixed nerves contain
A. fibers from two different senses. B. both sensory and motor fibers. C. both excitatory and inhibitory fibers. D. fibers controlling voluntary and involuntary actions.
In cells that are not dividing, chromosomes uncoil to form a tangle of fine fibers known as
A) histones. B) histiocytes. C) chromatin. D) chromaffin. E) genes.