Blood returning to the heart from the systemic circuit first enters the
A) right atrium.
B) right ventricle.
C) left atrium.
D) left ventricle.
E) conus arteriosus.
Ans: A) right atrium.
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Acetylcholinesterase
a. has enhanced activity from organophosphates. b. inactivates a neurotransmitter. c. is a neurotransmitter. d. stimulates an excitatory postsynaptic potential. e. triggers the release of sodium into postsynaptic cells.
Which of the following statements concerning the principal fiber bundles of the peridontal liagments is true?
(a) they are composed of elastin (b) they extend from the cementum to the enamel (c) they extend from the dentin to the cementum (d) they are composed of collagen (e) they extend from one tooth to the next
The proliferative phase of the uterus is driven by estrogen from the ovaries.
Answer the following statement true (T) or false (F)
The palate separates
A. the small and the large intestine. B. the oral and nasal cavities. C. the esophagus and the larynx.