) Explain why an 80-year-old woman requires a much longer time to recover from the flu than does a woman who is age 30.
What will be an ideal response?
As we age, our body's control systems become less efficient. As a result, our internal environment becomes less and less stable.
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Which of the following statements regarding myosin in skeletal muscle is TRUE?
A. Troponin covers the binding site on myosin molecules until Ca2+ binds to troponin to remove it from its blocking position. B. The rate of ATP hydrolysis by myosin is the same in all types of skeletal muscle. C. All of the myosin cross-bridge heads in a thick filament are oriented and rotate in the same direction. D. Myosin cross-bridge heads contain two binding sites, one for actin and one for tropomyosin. E. Myosin is an ATPase.
The left side of the heart receives __________ blood from the __________ circulation and pumps it into the systemic circulation
Fill in the blank(s) with correct word
The citric acid cycle
A) begins with the formation of a molecule of citric acid. B) directly produces most of the ATP from the catabolism of glucose. C) consumes two moles of carbon dioxide. D) contains enzymes called cytochromes. E) forms acetyl-CoA from glucose-6-phosphate.
Which hormone is required for ovulation and formation of the corpus luteum?
A. FSH (follicle-stimulating hormone) B. LH (luteinizing hormone) C. TSH (thyroid-stimulating hormone) D. prolactin E. MSH (melanocyte-stimulating hormone)