Which of the following statements is NOT accurate with respect to erythrocytes?
A) They migrate into infected regions of tissue.
B) They transport oxygen and carbon dioxide.
C) They lack mitochondria.
D) They lack nuclei.
E) They contain large amounts of hemoglobin.
Ans: A) They migrate into infected regions of tissue.
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Which of the following illustrates a positive feedback mechanism?
A. Control of blood sugar B. Maintaining blood pressure C. Body temperature control D. Uterine contractions during childbirth
Reflux of gastric contents into the esophagus occurs because of
A. relaxation of the cardiac sphincter. B. contraction of the pyloric sphincter. C. spasms of the submucosal layer of the stomach wall. D. increased hydrochloric acid production by the parietal cells. E. increased amounts of mucous produced by the stomach.
In the air we breathe, which gas is found in the highest concentration?
A) Nitrogen B) Carbon dioxide C) Water vapor D) Hydrogen E) Oxygen
What is a gland?
What will be an ideal response?