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Heart Regulation #3
Intrinsic and Extrinsic Regulation
1. Baroreceptors and sympathetic stimulation are both components of "intrinsic" regulation of the heart.
2. When blood pressure increases, baroreceptors are stimulated and action potentials are sent by sensory nerves to the cardio regulatory center.
3. Increased sympathetic stimulation of the heart will cause an increase in Cardiac Output (CO).
4. Parasympathetic stimulation of the adrenal gland will cause the release of epinephrine.
5. Increased parasympathetic stimulation, along with reduced sympathetic stimulation, of the heart will result in reduced cardiac output.
6. Increased quantities of epinephrine in the blood will result in decreased cardiac output.
7. Generally - blood pressure will increase when cardiac output is increased.
8. During a severe loss of blood (hemorrhage) - the loss in blood pressure will cause increased sympathetic stimulation of the heart and increased heart rate will result.
9. Sympathetic nerves innervate the adrenal gland.
10. Starlings law is an example of "extrinsic regulation of the heart."
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Last modified on November 14, 2005