PHYSIOL 1 Lecture Notes - Lecture 6: Cardiac Muscle Cell, Heart Valve, Cardiac Muscle
Document Summary
Pumps blood throughout the body, supplying oxygen and nutrients to the tissues while removing co2. Prevent backflow of blood from the ventricles into the atrium during ventricular contraction. Pocketlike structures attached at the point where the pulmonary artery and aorta leave the ventricles. Major type of heart cell responsible for contraction. Respond to ca2+ with atp hydrolysis contraction. Lots of gap junctions allow e- info to spread quickly. About 1% of cells in the heart are part of the conduction system. Specialized heart cells that control muscle contraction. Some are innervated by sns & psns. Via action potentials generated in the conducting cells. Stimulate cardiac myocytes in a rhythmic fashion. Autorhymicity: ability of a cell to have a rhythmic spontaneous excitation. Cardiac myocytes have a very long refractory period. Due to na+ inactivation & plateau due to l-type ca2+ Blood flow through the heart in a single beat. Rhythmic contractions and relaxations of atria and ventricles.
