An action potential
A. has no repolarization phase.
B. is an example of negative feedback.
C. propagates across the plasma membrane in a decremental fashion.
D. cannot transmit information.
E. occurs when the local potential reaches threshold level.
Answer: E
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Fill in the blank with correct word.
Which of the following describes titin's roles in muscle contraction?
A. Helps to hold the actin myofilaments in position B. Accounts for muscle's extensibility and elasticity C. Allows the sarcomere to recoil and stretch D. Accounts for muscle's excitability
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A. suppress the immune response in the recipient. B. reduce the differences between donor proteins and recipient proteins. C. stimulate the formation of antibodies by the immune cells of the recipient. D. reduce the chance of infection in the recipient.
The thirst mechanism is invoked when
a. plasma osmolarity increases b. plasma osmolarity decreases c. hypothalamic osmoreceptors are activated d. a and c occur e. b and c occur