Cytotoxic T cells destroy their target cells by releasing perforin, which cuts holes in
A) lysosomes. B) cell membranes.
C) ribosomes. D) DNA molecules.
B
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What does oxygen deficit represent?
A) amount of energy needed for exertion B) the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used C) the amount of oxygen taken into the body prior to the exertion D) the amount of oxygen taken into the body immediately after the exertion
An example of filtration in the body is the movement of water and small solutes through the walls of capillaries.
Answer the following statement true (T) or false (F)
Reduced hormone concentration in the blood often causes target cells to
A. up-regulate receptors in order to increase cell sensitivity. B. up-regulate receptors in order to decrease cell sensitivity. C. down-regulate receptors in order to increase cell sensitivity. D. down-regulate receptors in order to decrease cell sensitivity.
When the thick and thin filaments slide past each other, which of the following is TRUE?
A) The Z disk to Z disk unit moves apart. B) The myofibril doubles in size. C) The muscle loses tone. D) The sarcomere gets shorter.