Cy Dill noticed that when he traveled from his home at 1,100 ft. elevation, to hike in the forest at 8,000 ft. elevation, his respiratory rate was elevated even while he was resting. This is because
A. the partial pressure of carbon dioxide is greater at higher elevations.
B. the partial pressure of oxygen is lower at higher elevations.
C. the air is "thinner" at higher elevations.
D. his proprioceptors were stimulating his respiratory center. E. there would be a decrease in blood pH at that altitude.
Ans: C. the air is "thinner" at higher elevations.
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The genotypes and phenotypes that result from a cross of AA and Aa (A = normal pigmentation and a = albinism) are
A. phenotypes:all normal; genotypes:50% homozygous dominant and 50% heterozygous. B. phenotypes:50% normal and 50% albino; genotypes:all heterozygous. C. phenotypes:all albino; genotypes:50% heterozygous and 50% homozygous recessive. D. phenotypes:75% normal and 25% albino; genotypes:75% heterozygous and 25% homozygous.
An increase in the PCO2 of arterial blood may result in respiratory centers acting to
A) decrease the rate of breathing. B) increase the rate of breathing. C) decrease pulmonary ventilation. D) increase the amount of air in the anatomic dead space. E) decrease the vital capacity.
Becoming more physically fit ____________________ a person's cardiac reserve
Fill in the blank(s) with correct word
Match the phrase to either the sympathetic or parasympathetic division of the autonomic nervous system.Effects are more general
A. Parasympathetic B. Sympathetic