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: Heart Regulation 1
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Heart Regulation #1
Intrinsic and Extrinsic Regulation
1. Cardiac Output (CO) is measured in "beats per minute."
2. Stroke Volume (SV) is measured in "ml per minute."
3. Heart Rate (HR) is measured in "beats per minute."
4. CO = HR X SV
5. Stroke Volume (SV) is measured in "ml per beat" - the blood pumped per ventricle each time the heart contracts.
6. Cardiac Output can be increased by increasing either SV or HR, or even by increasing both SV and HR.
7. Cardiac output (CO) is the volume of blood pumped by either ventricle of the heart in one minute.
8. "Intrinsic regulation" of the heart refers to mechanisms contained within the heart itself.
9. Increasing "preload" will increase the stretching of the ventricles - which then relates to increased stroke volume.
10. Preload is the total volume of blood in the IVC and SVC during ventricular contraction.
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Last modified on November 14, 2005