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Blood and the Circulation - Blood pressure and carbon dioxides effect on the heart.
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| Submitted: Wed Nov 19 2003
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Blood and the Circulation Blood pressure and carbon dioxides effect on the heart The heart responds to both changes in blood pressure and changes in carbon dioxide levels in the blood. The pumping of the heart, combines with the narrowness of the smaller blood vessels, produces considerable pressure in the arteries. This is what we mean by blood pressure. It is important that our blood pressure should be reasonably high because it keeps the blood on the move. The heart rate responds to changes in blood pressure and the blood pressure goes up and down as the heart beats. It is highest when the heart contracts, systolic pressure, and lowest when the heart relaxes, diastolic pressure. This happens as there are pressure receptors in the walls of some of the main arteries. If the blood pressure rises then these receptors send impulses to the medulla. The medulla then sends impulses to the heart...
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