Some studies theorize that yawning is a reflex triggered by increased blood pH as carbonic acid is produced to expel CO2 by exhaling. Which structures would be stimulated to induce yawning if this theory is true?
A. Arterial baroreceptors
B. Baroreceptors in the aortic arch
C. Aortic bodies and carotid bodies
D. Free nerve endings in the blood vessels
Answer: C
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Which factor would result in bronchoconstriction?
a. sympathetic stimulation. b. secretion of acetylcholine c. epinephrine secretion. d. increased carbon dioxide concentration. e. none of these answers.
Which of the following bones is associated with the skull but not part of the cranium?
a. Palatine b. Ethmoid c. Vomer d. Lacrimal e. Hyoid
Glomerulonephritis is inflammation of the
A. collecting ducts. B. peritubular capillaries. C. glomerular capsule. D. glomerular capillaries.
Ethylene chloride is the toxic gas mentioned in the text that can be used to chemically sterilize surgical instruments
Indicate whether the statement is true or false