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dayle wallson 20 November 2012
Transcript of Cardiovascular system.
Blood is made up of 4 main components: red blood cells, white blood cells, platelets and blood plasma.
The red blood cells carry oxygen to the body cells, the white blood cells are used for fighting infections in the body and the platelets are used in the clotting process when a blood vessel is damaged.
Blood plasma is the water that helps the blood flow around the body pulmonary artery 4. Thermoregulation & Vasodilation/Vasonconstriction.
Thermoregulation is where the brain helps to monitor the body temperature through 'negative feedback'.
Vasodilation occurs when the body wants to cool down, by allowing more blood flow to the bodies surface, it also happens during exercise where the body allows more blood flow to the muscles being exercised.
Vasoconstriction is the opposite in which if the body wants to retain heat it restricts blood flow at the bodies surface. It also does this during exercise in which the body organs that don't require as much blood have their blood restricted so that the body can carry on exercising. . Aorta Vena Cava pulmonary artery .pulmonary veins pulmonary veins vena cava right ventricle right atrium tricuspid valve left atrium bicuspid valve left ventricle 16. septum aortic valve 5. How Does The CV System Deliver O2 & Remove Waste Products?
The pulmonary circulation system pumps blood through the lungs to pick up oxygen. This oxygen rich blood then returns to the heart for its next journey. Systemic circulation delivers oxygen-rich blood to the body organs, tissues and cells. Oxygen is transferred from the lungs to the red blood cells which are full of carbon dioxide from the cells, they are exchanged so that the red blood cells are now full of oxygen which goes to the heart and the lungs are now full of carbon dioxide. The carbon dioxide is breathed out and then air which has oxygen is then breathed in to the lungs. The red blood cells are pumped around the body to the cells which exchange the cells carbon dioxide from respiration with oxygen from the lungs. The red blood cells are then pumped back to the heart for the process to begin again. aorta arteries- very muscular and elastic.The tunica intima is the innermost layer composed of three smaller layers that are responsible for the smooth lining of the arteries that allow free blood flow. Veins are found in many different sizes throughout the body, but all contain a muscular layer. Veins also have three layers: tunica external, tunica media and tunica intima. Since they do not have to withstand as much pressure as arteries, they are much less muscular and elastic and the walls of veins are much thinner than artery walls. Veins also have valves that allow blood to flow in only one direction: back to the heart. Capillaries are the smallest of the blood vessels. These microscopic vessels have very thin walls. There are tiny openings in the walls of the capillaries that allow white blood cells to enter the tissue as well, so they can destroy bacteria. they are one cell thick.