The ultimate source of the fluids secreted into the digestive tract is the plasma
Indicate whether the statement is true or false
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When outdoor temperatures reached a ten-year high, the mountain hiker appeared flushed. Which action made her blood vessels get larger in diameter allowing her to lose heat to the environment?
A) Vasodilation B) Vasopressor C) Vasoconstriction D) Vasomotor
The beating of the cilia of the respiratory passages in the direction of the pharynx forms a(n)
A) debris filter. B) mucus escalator. C) respiratory rhythmicity center. D) smooth slick surface allowing particles to slide. E) increased surface area for gas exchange.
The frequency of a sound is indicated to the nervous system by the
A) frequency of hair cell vibration in the spiral organ. B) number of rows of hair cells that are stimulated in the spiral organ. C) region of the basilar membrane of the spiral organ that is stimulated. D) movement of the perilymph in the cochlear duct. E) frequency of vibration of the tectorial membrane of the spiral organ.
Which describes a characteristic of free radicals?
A. They rapidly oxidize other atoms by removing an electron. B. They are inert molecules that don't interact readily with other molecules. C. They contain two electrons in the outermost orbital. D. They have extra neutrons in their nuclei. E. They are found in high quantities in most sports drinks.