Why is vitamin D production by the skin important to the body?
A. Vitamin D protects the skin from UV light.
B. Vitamin D is necessary for calcium absorption.
C. Vitamin D adds strength to the skin, making it hard to penetrate.
D. Vitamin D protects the skin from pathogens.
Answer: B
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Atrial fibrillation is characterized by slow, irregular, uncoordinated depolarizations of the atria with no definite T waves
a. True b. False Indicate whether the statement is true or false
In an experimental study, a researcher transects cranial nerve IX in a dog. Compared to an unoperated animal, which of the following responses to the sight and smell of a meal will be reduced?
A. pancreatic enzyme secretion B. relaxation of the sphincter of Oddi C. gastric acid secretion D. gastric relaxation E. salivation
The term meaning programmed cell death is
A) oncogenesis. B) diuresis. C) cytocide. D) necrosis. E) apoptosis.
Answer the following statements true (T) or false (F)
1. The medically correct name for a “heart attack” is angina pectoris. 2. The coronary sinus carries blood from the aorta to the muscle of the heart. 3. The terms “cardiac output” and “stroke volume” mean the same thing. 4. The P wave, QRS complex, and T wave in an ECG all record depolarizations in different parts of the heart. 5. Both arteries and veins have the ability to dilate and constrict to regulate the amount of blood passing through them.