Please answer question: LOL FinaT 1, Greyhound dogs increase their cardiac outpu

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LOL FinaT 1, Greyhound dogs increase their cardiac output by 300-400% during a race. To test the importance of parasympathetic and sympathetic nerves in controlling heart function, experimenters cut all vagal (parasympathetic) and sympathetic nerves to the hearts of several racing greyhounds and measured their cardiac functions during a race. Surprisingly, the cardiac output of the operated dogs was nearly the same as in greyhounds with their autonomic innervation intact (CO was reduced by about Describe how cardiac output remains roughly the same in the dogs with denervated hearts, as well as wh in blood flow to the muscles 5%). at is aiding an increase

Explanation / Answer

Even though when both sympathetic and parasympathetic nerves are cut the cardiac output is increased because the beta receptors in heart will be upregulated and systemic catecholamine will bind to these receptors and increase the contractile function of heart and thereby increasing cardiac output.

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