Role Of White Blood Cells

Right ventricle:
The right chambers role is to receive the deoxygenated blood from the right atrium, as this blood flows from the right atrium it passes through the tricuspid valve and into the right ventricle. The ventricle then pumps the blood through the pulmonary valve, then the pulmonary artery to the lungs in order for it to be oxygenated. Within each cardiac cycle, the atria and ventricles contract and relax alternatively, this action forces blood from areas of high pressure into areas of low pressure. As chamber in the heart contracts, blood pressure within it increases. Regular contractions of one of the chambers in the heart are called systole, while the relaxation period, when the cardiac muscle is relaxed is called diastole. This …show more content…
Their role within the body is to protect against infectious diseases and foreign invaders. White blood cells are also known as leukocytes and there way of protecting the human body is by, first identifying then destroying and removing pathogens. They also remove damaged cells and foreign matter from the body. Leukocytes are created from bone marrow and circulate in the blood and lymph fluid, but can leave the blood vessels in order to travel to the body’s tissue. White blood cells are placed into categories, depending on the presence or absence of digestive enzymes or other chemical substances. Furthermore, they are categorised as either granulocyte or …show more content…
Macrophages are present in most tissues and they actively form phagocitic functions where as, dendritic cells are usually found in the tissue within areas that have been in contact with antigens from an external environment. They are most commonly found in the nose, skin and gastrointestinal tract. The main role of the dendritic cells is to provide information to lymphocytes in lymph nodes and organs, this also assist in the development of antigen immunity. Red blood cells are biconcave disc and there role is to transport oxygen to the body’s cells and carbon dioxide to the lungs. The given shape of the red blood cell allows it to manoeuvre through tiny blood vessels in order to deliver oxygen. Red blood cells also play an important role in establishing blood type, by the presence or absence of certain antigens on their surface. This also assists the body’s own immune system in recognising its own red blood cell type. Their cytoplasm is packed with haemoglobin which binds with oxygen as the oxygen molecules enter blood vessels in the lungs. Mature cells have no nucleus and this enables them to have more room inside them for haemoglobin, due to them being small and flexible they can be flattened against the capillary walls and are able to reduce the distance that gases have to diffuse