Gray matter contains primarily
A) myelinated fibers.
B) neuron cell bodies.
C) Schwann cells.
D) oligodendrocytes.
Ans: B) neuron cell bodies.
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The area of a myofibril where there are no actin filaments is the
A) H band. B) M line. C) I band. D) Z line. E) A band
Why does muscle activity affect the temperature of the body?
A. The rate of chemical reactions increases in muscle fibers during contraction, so the rate of heat production also increases. B. Muscle contraction generates pyrogens which reset the body's internal thermostat to a higher temperature. C. Muscle activity directs more warm blood to the muscles away from the central core causing a cooling effect on your internal organs. D. Increased muscle activity causes a rise in adipose stores which increases the insulation value of the body.
An immune attack against the body's own tissues results in a/an ________ disease.
Fill in the blank(s) with the appropriate word(s).
Which of the following is a secondary sexual characteristic promoted by estrogen?
A. growth of the mammary glands B. enlargement of the external genitalia C. stimulation of oogenesis D. thickening of cervical mucus