Cytotoxic T cells ________
A) require the double recognition signal of class I MHC plus class II MHC on the target cell in order to function
B) self-destruct once the antigen has been neutralized
C) function mainly to stimulate the proliferation of other T cell populations
D) can directly attack and kill other cells of the body
D
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The number of chromosomes in a secondary oocyte is
A. less than the number in a polar body. B. the same as the number in a mature sperm. C. greater than the number in a polar body. D. greater than the number in a mature sperm. E. less than the number in a mature sperm.
What is a typical value of the resting potential of the sarcolemma?
A) 70 mv B) -70 mv C) -45 mv D) -15 mv
The ________ mesenteric ganglion receives preganglionic sympathetic neurons from the T10-T12 segments of the spinal cord.
Fill in the blank(s) with the appropriate word(s).
The second heart sound (dup) results from the closing of the ________ valves in the beginning of ________.
A. AV; ventricular systole B. AV; ventricular diastole C. semilunar; ventricular diastole D. semilunar; ventricular systole