PHYSCI 5 Study Guide - Final Guide: Left Coronary Artery, Mitral Valve, Anterior Interventricular Branch Of Left Coronary Artery
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Made up of the heart, blood and blood vessels. Blood flows through the body via the arteries, oxygen is delivered throughout and carbon dioxide is gathered. Blood supply to the heart comes from the coronary circulation. Lub is the atrioventricular valves opening (tricuspid and bicuspid), during ventricular contraction. If there is a heart murmur, it means the valves are not functioning has a swish" sound, could be due to blood leaking from the atria to the ventricles. Heart creates its own electrical potentials pulmonary circulation. Contractions are constant, the specialized cells instigate and spread the electrical impulses throughout; the heart muscle make up the cardiac conduction system. Contractions per minute = beats per minute. Heart rate can be increased by the cardiac conduction system. Blood vessels: form a closed circuit, arteries, arterioles, capillaries, venules and veins, blood flow to organs is not constant to maximize efficiency. Increasing blood flow widen lumen, bp decreases, smooth muscles relax, vasodilation occurs: tunica intima:
