Circulatory system

• The heart is a muscular organ that pumps blood around the body.
• Blood is a tissue and it has 4 main components 1. Plasma 2. Red Blood Cells 3. White Blood Cells 4. Platelets
• Plasma is the liquid part of blood, which carries nutrients to cells and removes waste products from them.
• Red blood cells contain haemoglobin, which binds with oxygen molecules and transports them around the body.
• White blood cells are involved in fighting infection by engulfing pathogens (phagocytosis).
• Platelets clump together at sites of injury to form a plug and prevent further bleeding.
• White blood cells are involved in fighting infection by engulfing pathogens (bacteria) and destroying them.
• Arteries carry blood away from the heart under high pressure.
• Veins carry blood back towards the heart under low pressure.
• Capillaries connect arteries and veins and allow exchange between blood and tissues.
• Valves ensure that blood flows only one way through the heart.
• Atria receive blood from veins and ventricles pump blood out into arteries.
• The heart is located between the lungs and consists of four chambers - two atria and two ventricles.
• The circulatory system consists of the heart, arteries, veins, capillaries, and blood.
• Blood is pumped through the circulatory system by the contraction of the heart's ventricles.
• Red blood cells transport oxygen around the body.
• Deoxygenated blood returns to the heart via the superior vena cava and inferior vena cava.
• Deoxygenated blood is on the righth side of the heart and oxygenated blood is on the left side of the heart
• haemoglobin is a protein that carries oxygen in the blood
• Veins are on the right side of the heart and carry deoxygenated blood
• arteries have a thicker 3 layered wall and a thick muscular layer
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  Plasma is a yellow substance in the blood wich carries WBC RBC glucose amino acids carbon dioxide urea and hormones and proteins