Unit 5 - P3

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Unit 5 – Anatomy and Physiology P3 Jayne Catley Caitlin Garrett In this piece of writing I will be outlining the gross structures of all the main body systems(P3) Circulatory System; The circulatory system is the body’s main transport system and consists of; * Blood * Blood vessels * The heart The circulation is divided into two systems; * The general or systemic circulation in which the blood flows around the body to all the body systems. * The pulmonary circulation where blood is carried to and from the lungs. The blood is pumped from the heart into the arteries, which leads to smaller vessels called arterioles. It is then passed through the tissues in the capillaries. Blood is then carried back to the heart through the venules and then followed by the veins. Blood provides the fluid environment for the body’s cells and it is transported in specialised tubes called blood vessels. The heart acts like a pump, which keeps the blood circulating around the body in a constant circuit. This system consists of the heart, blood vessels, blood, lymphatic and lymph. The main functions of the blood are to transport, defence, regulation and clotting. The oxygen is carried from the lungs to the cells of the body in red blood cells. Carbon dioxide is carried from the body’s cells to the lungs. Cellular waste such as water, carbon dioxide, lactic acid and urea are carried in the blood to be excreted. Hormones, internal secretions that help to control important body processes are also transported by blood to target organs. White blood cells are collectively called leukocytes and they play a major role in fighting infections and diseases. Blood helps to regulate the temperature in the body by absorbing large quantities of heat produced by the liver and the muscles; this is then transported around the body to help maintain a constant internal
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