Ventricular contraction begins at the
A. apex of the heart.
B. top of the ventricles.
C. base of the heart.
D. AV bundle.
E. superior portion of the interventricular septum.
Answer: A
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The primary reproductive organs in the male include the
a. testes b. prostate gland c. seminal vesicles d. bulbourethral glands e. all of these
Before an amino acid can be broken down for energy:
A. the side chain must be removed. B. the carboxyl group must be removed. C. it must be converted to NAD+. D. the amino group must be removed. E. it must be phosphorylated.
Which of the following statements concerning implantation is correct?
a. Implantation is accomplished by enzymatic activity of the trophoblastic layer of the blastocyst. b. The endometrium at the site of implantation is converted into the nutrient-rich decidua. c. Implantation occurs within 24 hours after fertilization. d. Both (a) and (b) above are correct. e. All of these answers are correct.
Blood clotting is an example of positive feedback since the action of the effector opposes that of the stimulus.
Answer the following statement true (T) or false (F)