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THE HEART The circulatory system (transport system) transports oxygen and nutrients. Blood - Carries oxygen and nutrients. Blood vessels - Hold the blood. The Heart - Pumps the blood to keep it moving through the vessels ♡ = FLOW OF OXYGENATED BLOOD = FLOW OF DEOXYGENATED BLOOD PULMONARY ARTERY VENA CAVA RIGHT ATRIUM HEART VALVE RIGHT SIDE TENDONS ATTACHED TO VALVE AND HEART WALL RIGHT VENTRICLE LEFT SIDE AORTA PULMONARY VEIN LEFT ATRIUM HEART VALVE LEFT VENTRICLE ARTERIES move blood away from the heart fast, leading to a high blood pressure. The wall structure is thick and arteries contain muscles and elastic fibres to keep up with the pressure. There are no valves present in arteries and the blood is usually oxygenated. VEINS move blood away from organs in the body and moves blood towards the heart. This means the blood pressure in the veins is low (meaning there are thin walls). The wall thickness leads to a large lumen and veins often have valves to keep the blood flowing in the right direction and prevent back flow. The blood is usually deoxygenated in the veins. The AORTA transports oxygenated blood from the heart to the rest of the body. The pulmonary artery transports deoxygenated blood from the heart to the lungs. The pulmonary vein transports oxygenated blood from the lungs to the heart. The VENA CAVA transports deoxygenated blood from the body to the heart. CAPILLARIES move blood from the heart and back to the heart. There is a high blood pressure. The walls of the capillaries are only once...

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Alternative transcript:

cells thick so CO2 and 02 can diffuse easily. The walls mean there's only a thin vessel and a narrow lumen. There are no valves and the blood in the capillaries is deoxygenated. BLOOD VESSELS: Arteries Thick layers of muscles and elastic fibres. High blood pressure. Capillaries - Permeable walls. High blood pressure. Veins Contains valves to prevent a backflow of blood. Low blood pressure.