The P wave of an ECG represents
a. the contraction of the atria.
b. the contraction of the ventricles.
c. the depolarization of the ventricles.
d. the depolarization of the atria.
e. the repolarization of the ventricles.
D
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Chemical reactions that break down complex organic molecules into simpler ones are called
a) Metabolism b) Anabolism c) Catabolism d) Metatheses e) Oxidation reactions
A ________ is a channel between cells.
Fill in the blank(s) with the appropriate word(s).
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.
A primary oocyte with a single layer of granulosa cells is most appropriately called
A. a primordial follicle. B. a secondary follicle. C. a mature follicle. D. the corpus luteum. E. a graafian follicle.