The major body parts derived from endoderm are the epithelial lining of
A) all of the above. B) the digestive tract.
C) the urinary bladder. D) the respiratory tract.
A
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High levels of radiation are NOT used
A. to kill cancer cells. B. to sterilize medical equipment. C. as tracers to detect molecular changes.
Crossing over is important for ________.
increasing genetic variability preventing mutations limiting genetic recombination maintaining chromosome structure
During a normal inspiration, which event occurs first?
A. air flows into lungs B. alveolar pressure becomes subatmospheric C. diaphragm contracts D. intrapleural pressure becomes more negative E. thoracic volume increases
A person has a 50% blockage of one coronary artery but a good prognosis because of vessel anastomoses. What can this person do to increase the density of these anastomoses?
A. Engage in aerobic exercise B. Eat a high-fat diet C. Control elevated blood glucose D. Maintain a sedentary lifestyle