In this close-up image of a lung, what structure does number 1 indicate?
A. Alveolar duct
B. Respiratory bronchiole
C. Terminal bronchiole
D. Bronchiole
E. Alveolus
Answer: C
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The force responsible for normal expiration is supplied by the
A) diaphragm. B) contraction of smooth muscles in air passages. C) external intercostal muscles. D) elastic recoil of tissues and surface tension.
Which of the following factors should be considered when handling animals?
a. temperature b. stress c. teamwork d. all of the above e. none of the above
The circular muscle of the iris
a. contracts in response to bright light to produce pupillary constriction. b. is innervated by the parasympathetic nervous system. c. contracts to slacken the suspensory ligaments and increase the strength of the lens during accommodation. d. both (a) and (b) above. e. all of these answers.
Overproduction of thyroid hormone results in ____
a. cretinism b. Addison's disease c. polydipsia d. Graves' disease