Blood- circulatory system

• Job of red blood cells is to carry oxygen from the lungs around the body
• Red blood cells have a biconcave shape which gives them a larger surface area for absorbing oxygen
• Red blood cells have a red pigment called haemoglobin
• phagocytes are responsible for engulfing and destroying pathogens
• Lymphocytes are white blood cells that produce antibodies and help fight off infection
• Unlike red blood cells, white blood cells have a nucleus
• Platelets are small fragments of cells that help clot blood and form blood clots.
• Plasma is the liquid part of the blood that contains dissolved substances and carries oxygen and nutrients
• Arteries carry blood away from the heart and have thick muscular walls to withstand high pressure
• Capilleries are involved with gas exchange
• Veins carry blood to the heart at a low pressure. They have a large lumen and thin walls.
• The right side of the heart pumps deoxygenated blood to the lungs while the left side pumps oxygenated blood to the rest of the body.
• The cardiovascular system consists of the heart and blood vessels (arteries, veins, capillaries). It transports materials around the body.
• Capillaries are tiny blood vessels where gases and other materials can pass between the bloodstream and tissues.