Which of the following is the most abundant gas in our air?
A. Oxygen
B. Hydrogen
C. Nitrogen
D. Argon
Answer: C. Nitrogen
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The facial bone that is midsagittal structure is the
A) lacrimal. B) zygomatic. C) vomer. D) palatine. E) maxilla.
____________________ are traveling vibrations of air that consist of alternating with regions of low pressure caused by rarefaction of the molecules
Fill in the blank(s) with correct word
Which statement is incorrect?
a. Salivation is entirely under neural control. b. Parasympathetic stimulation and sympathetic stimulation both increase salivary secretion. c. The acquired salivary reflex occurs upon stimulation of chemoreceptors and/or pressure receptors in the mouth. d. Parasympathetic stimulation produces a watery saliva rich in enzymes. e. The salivary center is located in the medulla.
Electrical activity occurs at the AV node
a. during the P wave. b. between the P wave and QRS complex. c. during the QRS complex. d. between the QRS complex and T wave. e. during the T wave.