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IB Anatomy Supplemental

IB Anatomy Supplemental. Digestive Enzymes. http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_pumping.html. Heart Control. Myogenic muscle contraction: heart muscle can contract and relax without nervous system

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IB Anatomy Supplemental

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  1. IB Anatomy Supplemental

  2. Digestive Enzymes

  3. http://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_pumping.htmlhttp://www.nhlbi.nih.gov/health/dci/Diseases/hhw/hhw_pumping.html

  4. Heart Control • Myogenic muscle contraction: heart muscle can contract and relax without nervous system • SA node: tissue sends an electrical signal to stimulate atrial contraction (nearly every second) • AV node: tissue responds to SA node sending an electrical signal to stimulate ventrical contraction 0.1 seconds after it gets SA node signal • These act as the heart’s pacemaker to keep it “in time”

  5. Heart Control • When you exercise, CO2 levels in your blood increase • This increase is sensed by the medulla in your brain which sends a nerve signal through your cardiac nerve to the SA node which increases your heart rate • When you stop exercising, CO2 levels fall, and the medulla sends another signal to the SA node through the vagus nerve to return rate control to the SA node, slowing down the rate.

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