Heart - Heart Path Blood valves open & close Excitation...

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Heart Excitation – Conduction cells Path of excitation o 1) SA node firing stimulating atria muscle cells (physically in contact with) o 2) Intermodal fibers communicate with o 3) AV node o 4) Bundle of His o o 6) Purkinje cells – connected to (physically) the ventricle muscle cells o ALL connected by gap junctions – when one fires, all fire Excitation – Contraction – Contractile cells How regulate tension How relax How much pump? CO=HR*SV, Regulation of Pressures=?, Regulation of Skeletal muscle How contract? How relax? Regulate tension How start Endocrine (1) Hypoth – Pit – Post – Ant, Regulation – Feedback (2) Adrenal cortex – RAAS – functions of cortisol (3) Thyroid (handout) – medulla (symp. nervous sys) (4) Parathyroid – regulation of calcium (5) Islets – insulin, glucagon Sets BMR o Increase BMR Body temp. higher Hypothyroid – sensitive to cold b/c can’t regulate heat
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Heart - Heart Path Blood valves open & close Excitation...

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