PNB 2265 Chapter Notes - Chapter 3: Artificial Cardiac Pacemaker, Thoracic Cavity, Abdominal Cavity
7 Mar 2017
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Frog heart - pacemaker cells in sv node. Frog - one ventricle, mixing of oxygenated and de. Trabeculae (sight of attachment for papillary muscles, prevention de and oxy mix) and spiral folds (maintaining separation of de and oxy. De - systemic circulation returns to right through sc. Oxy - left atrium through pulmonary vein. Ventricle pumps one artery until further separation. De - lungs and skin (skin is another respiratory surface) String attached to force transducer and to hook on heart. Heart by apex and push into ventricle. Adjust level of transducer out of thoracic cavity. Ground electrode on left thigh with skin removed. Force transducer records electrical activity - contraction and relaxation. Quantify effects of diff temps, ions, and sym and parasymp neurotransmitters. Ach = heart might stop if concentration too high wash heart with warm ringer"s massage heart. Cardiac muscle refractory period extra stroke. Ecg not good remove ringer"s solution. Physical that affect heart rate and contractile forces.
