What stimulates the respiratory center to increase the breathing rate?
What will be an ideal response?
A rise in carbon dioxide levels
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While our personal genomes can identify genetic risk factors, disease risk is often greatly increased by (select all that apply)
A. diet. B. exercise. C. exposure to drugs and other chemicals in our environment. D. exposure to ultraviolet radiation. E. none of these
Which of the following gymnosperms undergoes double fertilization?
A. angiosperms, not gymnosperms, demonstrate double fertilization B. cycads C. gnetophytes D. epiphytes E. ginkgos
Which of the following respiratory surface properties enhances the diffusion of respiratory gases?
a. large surface area b. thick epithelial layer c. cool temperatures d. the presence of active transport pumps e. presence of carbon dioxide
An immediate source of energy for exercising muscle cells is _____.
A. creatine phosphate B. aerobic respiration C. anaerobic respiration D. fermentation E. glycolysis