Marine mammals use ____ to extend dive times
a. decreased blood volume
b. increased erythrocyte count
c. increased in lung volume
d. reduced concentrations of muscle myoglobin
e. elevated circulation to nonessential organs
ANSWER: b
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Which of the following occurs during human inhalation?
a. The diaphragm contracts and the external intercostal muscles relax. b. The diaphragm relaxes and the external intercostal muscles contract. c. The diaphragm contracts and the external intercostal muscles contract. d. The diaphragm relaxes and the external intercostal muscles relax. e. The diaphragm expands and increases oxygen uptake.
Endospores can be inactivated by
A. incineration. B. dry heat at 170°C for 2 hours. C. glutaraldehyde for 3 or more hours. D. ethylene oxide for 3 or more hours. E. All of the choices are correct.
Which of the following leukocytes kills its target cells, such as cancer cells or virus-infected cells, by releasing chemicals that break down the target cell membrane?
A) natural killer cells B) B lymphocytes C) basophils D) T lymphocytes E) macrophages
The evolutionary trends in primates include all of the following EXCEPT
A. stereoscopic vision. B. large, complex brain. C. a rounded, protruding face. D. mobile limbs. E. reduced reproductive rate.