Sensory neurons of the PNS are
A. Multipolar
B. Unipolar
C. Bipolar
D. None of the above
B. Unipolar
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Which of the following is not a method of gradation of skeletal muscle contraction?
a. twitch summation b. motor unit recruitment c. stimulating variable portions of each motor unit d. varying the number of motor units stimulated e. varying the frequency at which a motor unit is stimulated
Receptors for acetylcholine are located on the
A) synaptic knob. B) motor end plate. C) sarcomere. D) synaptic cleft. E) transverse tubule.
Which cells secrete highly alkaline mucus to protect the stomach walls from the hostile environment caused by the acid and digestive enzymes produced in the stomach?
A. Chief cells B. Endocrine cells C. Mucous cells D. Parietal cells
Residual air is important because it:
a. signals the need to breathe again b. provides a rest period for the respiratory muscles c. provides for continuous exchange of gases d. prevents collapse of the lungs