BSCI 202 Lecture Notes - Lecture 2: Interatrial Septum, Interventricular Septum, Thoracic Cavity
17 Dec 2018
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Document Summary
Function = delivering oxygen to the heart and nutrients and to remove carbon. Hormones, immune cells, clotting proteins tospecific target cells. A closed system of the heart and blood vesseld. Blood vesseld allow blood to circulate to all parts of the body. Gap junctions: form pores that allow electrical ions to flow rapidly through the heart which allows heart to contract as a unit. Desmosomes: specialized proteins resist mechanical stress so that the heart tissue doesn"t tear under the strong contractile force. Aerobic muscle = requires oxygen to generate atp. No cell division after infancy, growth by hypertrophy. Hypertrophy = present cells simply get larger: explains when you suffer a heart attack, the cells don"t regenerate when they die, they are replaced with scar tissue. 1% autorhythmic cells = generate their own rhythm; electrical in nature. The diaphragm separates abdominal cavity from the thoracic cavity. Pericardium = double walled membranous sac surrounding heart: peri- = around, - cardium = heart.
