How many flaps of tissue does a tricuspid valve have?
A) one
B) two
C) three
D) four
C
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Cells normally regulate the rate of an enzymatic reaction by
A) allowing all metabolic enzymes to be found throughout the cytoplasm. B) raising their temperature to 110° F. C) increasing reaction rate as the concentration of product increases. D) changing the concentration of an enzyme.
Hormones are secreted in response to all of the following stimuli except:
A. neuronal. B. humoral. C. hormonal. D. up-regulation.
Which of the following is not true of muscle tissues?
A. All muscle cells are striated. B. Muscle tissues are excitable. C. Muscle cells are specialized for contraction. D. Muscle cells have a difference in electrical charge across their plasma membrane. E. Muscle cells form the basis for the movement of body parts.
A protein that spans the cell membrane is termed a(n)
A. receptor protein. B. peripheral protein. C. integral protein. D. anchoring protein.