view-8.php - Cardiac Physiology Chapter 9 The Circulatory...

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Cardiac Physiology Chapter 9
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The Circulatory System Three main parts/components 1. A pump – The heart 2. Blood – The medium for carrying nutrient, gases and wastes. 3. Delivery, exchange and return system – The arteries, capillaries and veins
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HEART The heart establishes a pressure gradient to pump the blood. All the heart does is develop pressure to move the blood around the system.
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BLOOD VESSELS The blood vessels are passageways for the distribution of pumped blood throughout the body. The blood vessels deliver blood to and from the tissues. The pulmonary circulation is a loop of blood vessels between the heart and the lungs. The systemic circulation is the circuit of blood vessels between the heart and other body systems.
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BLOOD The blood is a transport medium, serving the needs of body cells. It carries gasses, nutrients, wastes etc. to and from the heart and tissues.
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Lungs Pulmonary capillaries Pulmonary circulation Right side of heart Left side of heart Systemic circulation Organ systems = O2-rich blood = O2-poor blood Pulmonary veins Pulmonary arteries Systemic arteries Systemic capillaries Systemic veins
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The heart is a muscular organ, about the size of a closed fist . It is located in the thoracic cavity, between the sternum and vertebrae. The base of the heart lies to the right of the sternum. The apex lies to the left of the sternum. By its location the blood can be manually driven from the heart by CPR.
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The heart is a dual sided, dual chambered pump. The atria are its two upper chambers. They receive blood returning to the heart (from veins) and transfer blood to the ventricles. The ventricles are the two lower chambers that pump blood from the heart. (via arteries) A septum separates the low-oxygen blood on the right side of the heart from the high-oxygen blood on the left side.
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The right side of the heart receives low oxygen blood from the body. The venae cavae are veins returning blood to the right atrium. Oxygen has been extracted from this blood. Carbon dioxide has been added to it. This blood is pumped from the right ventricle through the pulmonary artery to the lungs. Therefore the right side is called the Pulmonary Side.
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In the lungs, blood is re-oxygenated The lungs add oxygen to the blood. Carbon dioxide is removed from this blood. This blood flows through pulmonary veins to the left atrium of the heart.
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receives blood from the lungs. The left side of the heart receives blood from the pulmonary circulation. This high-oxygen blood is pumped from the left ventricle through the aorta, a large artery out to the body. It pumps it to all the systems of the body (systemic
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This note was uploaded on 05/02/2010 for the course PHYSIO EXERCISE P taught by Professor Gil during the Spring '10 term at UCSB.

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view-8.php - Cardiac Physiology Chapter 9 The Circulatory...

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