Bloodvesselsbrancheddistensibletubes

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Unformatted text preview: d forces Describes the physical principles governing pressure, flow, and resistance as they relate to the cardiovascular system Parts involved in Hemodynamics Parts involved in Hemodynamics “Motion and Force” Heart – an intermittent pump Arterial Blood flow – Pulsatile Blood vessels – branched, distensible tubes of various dimensions Blood – a suspension of blood cells, platelets, lipid globules, and plasma proteins Blood Flow in the Heart Blood Flow in the Heart Right atria receives blood venous blood from superior and inferior vena cava Tricuspid valve Right ventricle Pulmonic valve to pulmonary artery to lungs Left atria receives oxygenated blood from pulmonary veins Mitral valve Left ventricle Out aortic valve from L ventricle into aorta and systemic circulation Cardiac Cycle Cardiac Cycle Used to describe the rhythmic pumping action of the heart 60-100 be normal. During dia Semilunar closed. Th hear in th valves clo Divided into two parts: Systole: period when the ventricles contract Diastole: period when the ventricles are relaxed and filling Systole Systole Pressure increases in ventricles AV valves close (S1) Ventricles contract Pulmonary and aortic valves open Then close Repeat Diastolic Diastolic AV valves Open Atrial pressure increases Atrial Kick Ventricles relax during diastole Cardiac Output Cardiac Output Amount of blood the heart pumps each minute Determined by: Stroke Volume (SV): the amount of blood pumped with each beat Heart Rate (HR): the number of times the heart beats each minute Cardiac Output (CO) Heart Rate (HR) X Volume (SV) Figuring Cardiac Output Figuring Cardiac Output (CO) = SV X HR Example: 70ml X 70 bpm= 4900ml or 4.9 Lpm Conversion factor – 1000ml = 1L Factors Determining...
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