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BILD2_Lect_1_24_12 - The fluid that moves around in the...

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The fluid that moves around in the circulatory system of a typical arthropod is the A. intracellular fluid. B. interstitial fluid. C. blood plasma. D. lymph. E. cytosol. A nonfunctional sinoatrial node would A. cause the heart to stop beating in an autorhythmic fashion. B. result in a block in ventricular contractions. C. have no significant effect on stroke volume. D. have no effect on heart contraction. E. cause hormones to take over regulation of the heart beat. An adaptive advantage of having a three- chambered heart, as found in amphibians, over the two-chambered heart of fish is that A. fully oxygenated blood returning to the amphibian heart can undergo additional pumping to reach higher pressures. B. fully oxygenated blood is kept completely separate from relatively deoxygenated blood in the heart. C. there are capillary beds in both the respiratory organ and body systems of amphibians but not fish. D. the additional chamber in the amphibian heart reduces blood flow to the respiratory organ. E. amphibians can tolerate higher environmental pressures. Which of the following structures in a vertebrate with a four-chambered heart would have blood with the lowest oxygen concentration?
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