The glial cell that myelinates and insulates axons within the CNS is the
A. neurolemmocyte.
B. microglial cell.
C. ependymal cell.
D. oligodendrocyte.
E. astrocyte.
Answer: D
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Which of the following is a common effect of aging on skeletal muscle?
a) loss of muscle mass b) decrease in maximal strength c) a slowing of muscle reflexes d) loss of flexibility e) all of these are correct
The ________ of the sperm contains microtubules and mitochondria.
Fill in the blank(s) with the appropriate word(s).
Where are GLUT carriers located in an unstimulated muscle fiber?
A. Within cytoplasmic vesicles B. In the plasma membrane facing the external environment C. In the plasma membrane facing the internal environment D. There are no GLUT carriers present.
Which of the following is an accurate statement regarding aging and the immune response?
a. It increases until the age of 65 and then deteriorates. b. The function of the T cells diminishes with age. c. The thymus increases in size until it fails to generate T cells. d. The thymus is functionally until puberty.