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circulatory system: (blood cells: (red blood cells transports oxygen to…
circulatory system: 
blood:
it is a tissue made up of plasma and three types of blood cells - red blood cells white blood cells and platelets
plasma:
it is the liquid part of the blood and is mostly made up of water it transports dissolved substances around the body including oxygen glucose amino acids hormones and antibodies it also carries carbon dioxide and urea it also carries heat and blood cells around the body
blood cells:
red blood cells transports oxygen to cells so that respiration can take place they contain haemoglobin which contains iron and picks up oxygen for transport
white blood cells protect us from disease they work by 'eating' harmful microorganisms or producing antibodies that kill them
platelets are tiny fragments of larger cells that help the blood to clot. It helps to blood to heal wounds, maintain blood pressure and prevent the entry of pathogens
blood vessels:
arteries : it carries blood away from then heart it has thick walls to withstand the high pressure of blood pumped to the heart. The aorta is the main artery in the body
veins: carry blood to the heart their walls are thinner and blood pressure is lower than arteries so veins have valves which prevent the backflow of blood. The venae cavae are the major veins
capillaries: these link the arteries and veins together their walls are so thin so tiny molecules can pass through the surrounding cells
1.
blood with a little oxygen and a high concentration of carbon dioxide enters the right atrium through the venae cavae
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3.
the right ventricle contracts and forces blood up and out through a semilunar valve. The blood leaves the heart through the pulmonary artery
4.
the pulmonary artery delivers deoxygenated blood to the lungs. At the lungs carbon dioxide is lost from the blood and oxygen is taken into the blood. The blood is then fully oxygenated
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7.
the left ventricle then contracts which then forces blood up and out through a semilunar valve. The blood leaves the heart through the aorta and is then distributed to all the cells of the body
8.
exchange of molecules in the blood occurs at the capillaries. Capillaries reunite to form veins which collect into the venae cavae that return to the right atrium. This completes one entire cycle.
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