BIOC33H3 Chapter Notes - Chapter 14: Electrical Resistivity And Conductivity, Cardiac Arrhythmia, Tetanus

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C h a p t e r 1 4 c a r d i o v a s c u l a r p h y s i o l o g y. Is a muscle that contracts continually resting only in the milliseconds-long pause between beats. Lies in the center of the thoracic cavity. Heart angles to the left side of the body. *base is on the top and the apex is at the bottom. With in the thoracic cavity, the heart lies on the ventral side sandwiched between the two lungs. The heart is encased in a tough membranous sac: pericardium. A thin layer of clear pericardial fluid inside the pericardium lubricates the external surface of the heart as it beats with in the sac. Inflammation of the pericardium may reduce this lubrication to the point that the heart rubs against the pericardium creating a sound known as friction rub.

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