Physiology 2130 Lecture Notes - Lecture 8: Endoplasmic Reticulum, Skeletal Muscle, Cella
19 Jan 2016
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Transports co2 and waste from the cells: helps regulate body temperature and ph. Transports and distributes hormones and other substances within the body. Left ventricle has thicker wall than right ventricle [left side pumps blood to muscles of the body] Right atrium tricuspid valve [right atrioventricular (av) valve] right ventricle. Left atrium bicuspid valve [mitral valve] left ventricle. Superior/inferior vena cava right atrium tricuspid valve right ventricle pulmonary arteries . Lungs pulmonary veins left atrium bicuspid valve left ventricle aorta. 2 principal types of myocardial cells: contractile cells = similar features as skeletal muscles. Composed of contractile proteins actin/myosin in bundles of myofibrils surrounded by a. Form walls of the atria and ventricles sarcoplasmic reticulum [same as skeletal muscles] 1 nucleus per cell and lots of mitochondria [more than skeletal muscles] 1/3 of the volume is mitochondria. Very efficient at extracting o2 (about 80% efficiency; a lot higher than other cells)
