PNB 2265 Study Guide - Quiz Guide: Q10 (Temperature Coefficient), Sinus Venosus, Parasympathetic Nervous System
6 Feb 2017
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Anatomy of the frog heart: comparative anatomy with human heart. Factors that influence cardiac function: predict impact of various treatments on cardiac function. Comparative anatomy of the human and frog heart. Human heart: pace maker cells located in sa node and av node. Frog heart: 3 chambers instead of 4. 2 atria, 1 ventricle: pace maker cells located in sinus venosus (sv node) Provides site of attachment for papillary muscles. Reduce suction and eliminate mixing of oxygenated and deoxygenated blood. Guide blood flow to atria and pulmosystemic arteries while maintaining separation of oxygenated and deoxygenated blood: only one ventricle. Insert blunt end of scissors and cut upwards. Lift and cut skin on ventral side of frog. Lift abdominal musculature and cut into abdominal cavity. Cut away sternum to see heart clearly. Remove a small piece of skin from the leg to attach ground wire later. Cut away skin on right shoulder to pin positive recording electrode later.
