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The Circulatory System.docx

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Langara College
BIOL 1115

The Circulatory System  The circulatory system is composed of the heart, blood vessels and blood.  The function of the circulatory system is to transport oxygen, hormones, and nutrients to the cells that need it, also it picks up waste material such as carbon dioxide and lactic acid generated by the body's metabolic activates.  Pulmonary system is when blood vessels are going and from the lungs. Systemic system is when the blood vessels are going to the rest of the tissues of the body.  Right Atria, Left Atria, Right Ventricle, Left Ventricle.  It divides the left and right sides of the heart.  The right side is for Pulmonary system. The left side is for Systemic system.  The systemic system needs a higher pressure because it has to cover more area of the body compared to the pulmonary system that only travels to the lungs.  It prevent back flow of blood also it controls the direction of blood flow.  The cardiac muscle is special because if one fiber contracts all of them contracts. However, this means atria and the ventricle has separate fibers. Also they have the ability to extract 70-80% of the oxygen from the red blood cells.  First the pacemaker called the SA node sends a signal to the AV node then it goes to the AV bundle then the signal travels down the purkinjie fibers which travels throughout the ventricular fibers which cause the ventricle to contract.  There is a short delay of 0.10 seconds because it gives time for the atria to finish its contraction before the ventricles contract.  The components of the EKG waveform is P,QRS and T. P represents the atria depolarization. QRS represents the ventricular depolarization. T represents ventricular repolarisation.  An abnormal increase of heartbeat, second and third degree heart block, and too soon of a contraction.  The heart muscle is supplied by two major arteries called left coronary artery and right coronary artery. The blood is then collected by large veins and empty into the right
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