What is the major surgical procedure used to improve coronary circulation to the heart?
What will be an ideal response?
This process is called coronary bypass surgery, and it involves taking a piece of a small artery or a peripheral vein
from the leg (often, the femoral vein) and implanting it in a region around the heart to bypass the obstructed
regions of the coronary arteries. As many as four of the coronary arteries can be bypassed in a single operation, but
this procedure is reserved for cases of angina that do not respond to the treatments discussed previously.
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Which of the following is not an effect of thyroid hormone?
a. increased metabolic rate. b. increased tissue responsiveness to catecholamines. c. increased absorption of iodine from the digestive tract into the blood. d. normal growth. e. normal development of the nervous system.
Which statement accurately describes alveolar exchange of oxygen?
A. Oxygen diffuses from the blood to the alveolus because the alveolus has a lower partial pressure of oxygen. B. Oxygen diffuses from the alveolus to the blood because the alveolus has a lower partial pressure of oxygen. C. Oxygen diffuses from the blood to the alveolus because the alveolus has a higher partial pressure of oxygen. D. Oxygen diffuses from the alveolus to the blood because the alveolus has a higher partial pressure of oxygen.
What do the following statements have in common: dehydration, hypoxia, bleeding, and increased erythrocyte production?
A) They are all causes of polycythemia. B) They are all causes of anemia. C) They are all associated with normal hematocrit levels. D) They are not associated with hematocrit levels in the human body.
At birth the hairs of the scalp, eyelids, and eyebrows are replaced by coarser pigmented hairs called ________ hairs.
A. vellus B. pubic C. terminal D. lanugo E. primary