The T cells that limit the degree of immune system activation from a single stimulus are __________.
a. suppressor T cells
b. memory Tc cells
c. cytotoxic T cells
d. CD4 T cells
Answer: a. suppressor T cells
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As blood is pumped into the arterial trunks past the semilunar valves, it
A. pushes against the cusps, forcing the valves open. B. fills the cusps, causing them to expand and open up for the flow of blood. C. fills the cusps, causing them to expand and block the backflow of blood. D. pushes against the cusps, forcing the valves closed. E. None of these answers is correct.
A lever is acted on at two different points by two different forces which are called the
a) fulcrum and resistance. b) leverage and load. c) lever and resistance. d) effort and load. e) lever and effort.
About 90% of the secretory product released from the thyroid gland is in the form of
a. T3 b. T4 c. MIT d. DIT e. TSH
Daughter cells produced in meiosis have one-fourth the number of chromosomes as daughter cells produced in mitosis.
half the number of chromosomes as daughter cells produced in mitosis. the same number of chromosomes as daughter cells produced in mitosis. twice the number of chromosomes as daughter cells produced in mitosis. four times the number of chromosomes as daughter cells produced in mitosis.