Greyhound dogs increase their cardiac output by 300-400% during a race. To test
ID: 3482886 • Letter: G
Question
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 5%).
Describe how cardiac output remains roughly the same in the dogs with denervated hearts, as well as what is aiding an increase in blood flow to the muscles.
Explanation / Answer
Answer- Yes this is possible. When experimenters cut all vagal (parasympathetic) and sympathetic nerves to the hearts of several racing greyhounds and measured their cardiac functions during a race. The dog cannot send the massage to the heart to increase the output but in dog or human body their are some other factors which is responsible to increase the cardiac output.
Its heppend by the adrenal gland. At the time of running adrenal gland release their hormones such as glucocorticoids and mineralocorticoids which caused increase the level of glucose and minerals in the blood. It will increase the blood flow to the muscles.
Where secretion of adrenaline hormones also increase force of contraction of cardiac muscles which lead the increase in cardiac output.
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