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Cardiac muscle

Cardiac muscle - Transport and Circulation Cardiac Muscle...

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Transport and Circulation; Cardiac Muscle Cardiac muscle Ÿ Short and chunky Ÿ Cells interlock at intercalated disk that prevents tearing Ÿ Gap junctions provide electrical couple btw cells allowing AP to spread throughout the whole heart Ÿ Smooth muscle lack striation b/c actin and myosin filaments aren’t arrayed along the length of the cell Ÿ Myogenic: generates own AP that causes muscle contraction Ÿ Each cell has its own rhythm and contracts on its own Circulatory system Ÿ Open: There is no distinction btw blood and interstitial fluid (hemolymph) Ÿ Closed: Blood is confined to vessels Heart structure Ÿ Atria: receive blood returning to the heart Ÿ Ventricles: chambers that pump blood out of the heart Ÿ 3 main blood vessels: arteries, veins, and capillaries arteries: away from the heart veins: to the heart Ÿ Capillary bed is where gases are exchanged by diffusion Ÿ Capillaries à venues à veins Ÿ Atrioventricular (AV)valve: prevents flap from turning inside out Blood circulation in the heart 1. R ventricle pumps to lungs via pulmonary arteries 2. Blood flows through capillary beds in L and R lungs to load O 2 and unload CO 2 3. O 2
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