Active sites on the actin become available for binding after
A) actin binds to troponin.
B) troponin binds to tropomyosin.
C) calcium binds to troponin.
D) calcium binds to tropomyosin.
E) myosin binds to troponin.
C
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B lymphocytes
a. are responsible for antibody-mediated immunity. b. are activated by thymosin. c. mature and differentiate into macrophages. d. bind with foreign antigen in association with self-antigen. e. are attacked by AIDS virus.
The reason a human may be paler when exposed to cold temperatures is
A. purely psychological. B. dehydration of the stratum corneum. C. constriction of the dermal collagen and elastic fibers. D. vasodilation has occurred. E. vasoconstriction has occurred.
Which of the following is not true about the menisci in the knee joint?
A. made of cartilage B. larger surface area to distribute load C. absorb shock D. all of the above are true
The junction between an axon and the muscle fiber itself is called a _____________ junction
Fill in the blank with correct word.