The outermost portion of the tooth is called
A) root.
B) pulp.
C) dentine.
D) enamel.
E) cementrum
D) enamel.
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Regarding muscle fiber elongation,
A) many active mechanisms exist for muscle fiber elongation. B) muscle contraction is passive; whereas, elongation is active. C) opposing muscle movements are not a factor. D) gravity may help lengthen a muscle fiber after elongation. E) elastic forces are generated where a muscle fiber elongates.
Where does gas exchange occur within the lungs?
A) alveoli B) secondary bronchi C) bronchioles D) None of the listed responses is correct.
When an infection is present in the body the lymph nodes may _____. Select one:
a. contract b. swell c. produce more lymph d. increase immunity
Which of the following is true regarding the autonomic nervous system?
A. It has no ganglia along its nerves. B. It usually controls conscious actions. C. It uses the neurotransmitter acetylcholine exclusively. D. Its denervation would cause hypersensitivity. E. It controls skeletal muscle contraction.