jc254 Posted June 12, 2012 Report Share Posted June 12, 2012 Can anyone help with this question? cant seem to find the answer im looking for in txt books or google. In a human, resting cardiac output is approx 5 L min -1 of which 750 ml (15%) goes to skeletal muscle and 1.4 L (25%) goes to the digestive system. During exercise, cardiac output increases to 25 L min -1, with 20 L (80%) going to skeletal muscle, while flow to the digestive system decreases to 300ml (2%). How does the vascular system change to accommodate these changes to blood flow A really simple answer would be brilliant. Quote Link to comment Share on other sites More sharing options...
livingart Posted June 12, 2012 Report Share Posted June 12, 2012 through the sympathetic nervous system Quote Link to comment Share on other sites More sharing options...
jc254 Posted June 12, 2012 Author Report Share Posted June 12, 2012 through the sympathetic nervous system yes that is what is controling the activity but how does it change? Quote Link to comment Share on other sites More sharing options...
MarkLB Posted June 12, 2012 Report Share Posted June 12, 2012 Dilation? Quote Link to comment Share on other sites More sharing options...
jc254 Posted June 12, 2012 Author Report Share Posted June 12, 2012 Dilation? I wouldnt think so Quote Link to comment Share on other sites More sharing options...
livingart Posted June 12, 2012 Report Share Posted June 12, 2012 I wouldnt think so Taking Blood from the Organs When you begin to exercise, a remarkable diversion happens. Blood that would have gone to the stomach or the kidneys goes instead to the muscles, and the way that happens shows how the body's processes can sometimes override one another. As your muscles begin to work, the sympathetic nervous system, a part of the automatic or autonomic nervous system (that is, the brainstem and spinal cord) stimulates the nerves to the heart and blood vessels. This nervous stimulation causes those blood vessels (arteries and veins) to contract or constrict (vasoconstriction). This vasoconstriction reduces blood flow to tissues. Your muscles also get the command for vasoconstriction, but the metabolic byproducts produced within the muscle override this command and cause vasodilation, as we discussed above. Because the rest of the body gets the message to constrict the blood vessels and the muscles dilate their blood vessels, blood flow from nonessential organs (for example, stomach, intestines and kidney) is diverted to working muscle. This helps increase the delivery of oxygenated blood to working muscle further. http://health.howstuffworks.com/wellnes ... ology8.htm Quote Link to comment Share on other sites More sharing options...
Ira Posted June 12, 2012 Report Share Posted June 12, 2012 I wouldnt think so There isn't any other method available to manage relative flows around the body other than the constriction and dilation of blood vessels. Like LA's quoted text. Quote Link to comment Share on other sites More sharing options...
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