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: Heart Regulation 2
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Heart Regulation #2
Intrinsic and Extrinsic Regulation
1. "Preload" is related to the stretching of the myocardial walls - which is related to volume of blood in a ventricle just prior to ventricular contraction.
2. Decreasing preload will cause an increase in Stroke Volume (SV)
3. SV = CO X HR
4. Exercising will increase "preload" and therefore increase Cardiac Output (CO).
5. Both sympathetic and parasympathetic nerves innervate the heart.
6. There is a cardio-regulatory center located in the frontal lobe of the brain.
7. Increased parasympathetic stimulation of the heart will increase heart rate (HR).
8. There is a cardio-regulatory center located in the medulla oblongata - which is located in the brain stem.
9. Baroreceptors "measure" blood pressure in both the right and left ventricle.
10. Baroreceptors are located in the walls of the internal carotid artery and in the aorta.
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Last modified on November 14, 2005