EHS 385 Lecture Notes - Lecture 25: Pulmonary Vein, Pulmonary Artery, Exercise Physiology
2 Jan 2019
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3 functions of cardiopulmonary system: transport o2 and nutrients to tissues, remove co2 and waste products from tissues, regulate body temp. Increased cardiac output: redistribute blood flow from inactive organs to active skeletal muscle. Heart: creates pressure to pump blood. Arteries and arterioles: carry blood away from heart. Capillaries: exchange of o2, co2 and nutrients w/ tissues. Veins and venules: carry blood back to heart. Pumps deoxygenated blood to lungs via pulmonary arteries. Returns deoxygenated blood to left side of heart through pulmonary veins. Pumps oxygenated blood to whole body through arteries. Returns deoxygenated blood to right side of heart through veins. Heart wall made up of three structures: epicardium outer layer, myocardium middle layer made up of cardiac muscle fibers (heart muscle, endocardium- inner layer. Heart contraction depends on electrical stimulation of myocardium (wave of depolarization) Systole: contraction phase, ejects blood from heart, 2/3 blood ejected from ventricles per beat. Diastole: relaxation phase, filling w/ blood in heart.
