Which of the following would increase the rate of heatexchange between an animal and its environment?(A) feathers or fur(B) vasoconstriction(C) wind blowing across the body surface(D) countercurrent heat exchanger
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Which of the following would increase the rate of heat
exchange between an animal and its environment?
(A) feathers or fur
(B) vasoconstriction
(C) wind blowing across the body surface
(D) countercurrent heat exchanger
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- Discuss the adaptations that occur after heat acclimation. Why do these support us during exercise in the heat? Don't copy from GoogleDogs walk with much quicker strides than do humans. Is this primarily because, compared to human legs, dogs’ legs (i) are shorter; (ii) are less massive; (iii) have a higher ratio of muscle to fat; (iv) have paws rather than toes; or (v) more than one of these?Which of the following animals uses the largest percentage ofits energy budget for homeostatic regulation?(A) marine jelly (an invertebrate)(B) snake in a temperate forest(C) desert insect(D) desert bird
- Heat exchange with the environment depends on the surface area-to-volume ratio of the body. Assuming that the body shape of an animal is at least somewhat spherical, a considerable decrease in body size would _______ the surface area-to-volume ratio, and the ability to exchange heat with the environment would _______. A. increase; increase B. increase; stay about the same C. increase; decrease D. decrease; increase E. decrease; stay about the sameWhich of the following statements about skeletal muscle is CORRECT? Select one: a. An increase in Na+ concentration in the cytosol starts muscle filament sliding. b. The muscle is non-striated and involuntary. c. The muscle is involved in shivering thermogenesis. d. The muscle contracts in response to parasympathetic stimulation. e. The muscle contracts in response to hormones.(a)What are the stimuli in the picture? (b) What is our body’s response when the temperature of our body decreases? When it increases?
- suite of morphological and physiological specializations that permit metabolic heat retention (Carey et al., 1971; Block and Finnerty, 1994; Brill, 1994). More specifically, the RM is positioned medially, or closer to the vertebrae, and is served by a complex network of arteries and veins, which form countercurrent heat-exchanging retia (Carey and Teal, 1966; Carey et al., 1971; Bone and Chubb, 1983; Graham et al., 1983; Block and Finnerty, 1994; Dewar et al., 1994b; Patterson et al., 2011). Interestingly, swordfish are the only teleost species, other than the scombroid fishes, to exhibit a medially positioned RM that is served by a putative vascular rete; but, it is unclear to what degree these specializations function to control RM temperatures, especially during exposure to large and rapid changes in ambient conditions (Carey, 1990; Figure 1a). Question 5: Research: What is a rete? (plural: retia). Where is a rete found in the human body? Compare and contrast the function of…Some hostages in Beirut, Lebanon were chained to the floor for months at a time with no chance of exercise. When they were finally freed, why do you think they appeared so weak?Adult humans synthesize large amounts of ATP in the course of a day, but their body weights do not change significantly. In the same time period, the structures and compositions of their bodies also do not change appreciably. Explain this apparent contradiction.
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