Chapter+13+ Cardiovascular System

Chapter+13+ Cardiovascular System - Chapter 13...

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Chapter 13 Cardiovascular System Functions of the Circulatory System Transportation: ensure adequate blood flow through the capillaries to the various organs*** Respiratory: Transport 0 2 and Co2 Nutritive : Carry absorbed digestion products.to liver and to tissues Excretory : Carry metabolic wastes to.kidneys to be excreted (urea) Regulation: Hormonal: Carry hormones to target tissues to produce their effects. Heart produces hormone=atrial naturetic peptide ANP Heart produces ANP atrial naturetic peptide Temperature: .divert blood to cool or warm the body Protection: Clotting: platelets and plasma proteins Prevents blood loss. Immune: leukocytes (antibodies and T cells) cytokines and complement fixation protect against pathogens Leukocytes (antibodies and T cells), cytokines and complement fixation protect against pathogens. The Heart Blood ALWAYS enters via atria Figure 13.1 Learn pathway through the heart Base is top Apex is bottom Four chambers 2 Atria l and r atria – entry ® ventricle exit 2 Ventricles Heart is always drawn as if the person is facing you Know flow through the heart Figure 13.1 apex point Base –wide top Septum Interatrial Interventricular Base Apex Series Flow Through the Cardiovascular System Blood supply is on the SURFACE Pulmonary circuit- deoxygenated Supplied
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Blood vessels from heart to lungs and lungs to heart Systemic circuit-oxygenated Supplied Blood vessels from heart to systemic tissues and tissues to heart Oxygenation of Blood Pulmonary capillaries Blood entering lungs = deoxygenated blood Oxygen diffused from tissue to blood Blood leaving lungs = oxygenated blood Systemic capillaries Blood entering tissues = oxygenated blood Oxygen diffuses from blood to tissue Blood leaving tissues = deoxygenated blood 13.2** Location of heart Pericardium surrounds the heart, protects Path of Blood Flow Through the Cardiovascular System Location of the Heart Clinical Aspect Pericarditis = inflammation of pericardium Membranous sac surrounding heart Lubricates heart decreasing friction Angiogram of coronary arteries Cardiac Muscle Aerobic muscle needs A LOT of oxygen supply No cell division after infancy-growth by hypertrophy*** 99% contractile cells 1% autorhythemic cells Not parallel like skeletal, they branch and run into each other, woven together, so even all diff cells but when contracted they contract as a single movement. Hypertrophic Cardiomyopathy Genetic: 1:500 involves error in muscle proteins ^ thickness of left ventricular wall and septum Interferes with ejection of blood to aorta Early warning sign=angina or death Leading cause of sudden death in young athletes Heartbeat (ventricles) Wave of contraction through cardiac muscle
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Atria contract as a unit Ventricles contract as a unit
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This note was uploaded on 04/08/2008 for the course BIOL 2160 taught by Professor Kt during the Spring '08 term at LSU.

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Chapter+13+ Cardiovascular System - Chapter 13...

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