Heart

• The heart is divided into four chambers, two atria (right & left) and two ventricles (right & left)
• Blood flows from the right side to the lungs where it picks up oxygen and then returns to the left side of the heart
• Blood flows from the left side of the heart out to the rest of the body via arteries
• Oxygenated blood enters the left atrium which pumps it through the bicuspid valve into the left ventricle
• Blood flows from the right side to the lungs where it picks up oxygen and then returns back to the heart via pulmonary veins
• The left ventricle contracts and forces blood out through the semilunar valves into the aorta
• Blood flows from the left side of the heart out through arteries to all parts of the body
• Arteries carry blood away from the heart under high pressure
• Deoxygenated blood enters the right atrium which pumps it through the tricuspid valve into the right ventricle
• Arteries carry blood away from the heart
• Veins carry blood towards the heart
• Capillaries are tiny tubes that connect arterioles with venules
• Arterioles are small branches off an artery that supply capillaries with blood