Where are the olfactory receptors found?
a) A
b) B
c) C
d) D
e) U
b
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A malfunction of the ________ cells causes the body to fail to recognize itself.
A. B B. helper T C. memory T D. regulatory T
Which of the following does not describe the ANS?
A) a system of motor neurons that innervates smooth and cardiac muscle and glands B) a system of motor neurons that innervates all muscle cells C) involuntary nervous system D) general visceral motor system
What is the average respiratory quotient (RQ) based on the typical American diet?
a. 2.5 b. 1.8 c. 1.4 d. 1 e. 0.8
Explain why the propagation of action potentials along electrically excitable membranes occurs in only one direction
A) The refractory period prevents it from propagating back in the direction from which it began. B) All electrically excitable membranes have two poles, a positive and a negative pole, and the action potential can only travel towards the positive pole. C) All electrically excitable membranes have two poles, a positive and a negative pole, and the action potential can only travel towards the negative pole. D) The stimulation of electrically excitable membranes by neurons occurs on only one side of the membrane so it will travel to the other side. E) The repolarization period prevents it from propagating back in the direction from which it began.