Blood and circulation

• circulatory system transportts oxyggen and nutrients
• plasma carries water, proteins, hormones, glucose, urea, salts, vitamins, minerals, antibodies
• blood is made up of plasma, red blood cells, white blood cells, platelets
• red blood cells carry oxygen to tissues
• platelets clot the blood
• white blood cells fight infection
• heart pumps blood around body
• arteries take blood away from heart
• veins bring blood back to heart
• capillaries are tiny vessels that allow exchange between blood and tissue fluid
• blood pressure is caused by contraction of ventricles, which forces blood into arteries
• the circulatory system consists of the heart, arteries, veins, capillaries and blood
• The deoxygenated blood then returns to the right atrium via veins.
• Blood flows through capillary beds where oxygen and nutrients diffuse out of the blood and waste products diffuse into the blood.
• blood is pumped out of the left ventricle into the arteries, which carry it all over the body.
• pulmonary circuit carries deoxygenated blood from right side of heart to lungs where it picks up oxygen and releases carbon dioxide
• deoxygenated blood flows through systemic circuit (body tissues)
• oxygenated blood flows through pulmonary circuit (lungs)
• pulmonary valve prevents backflow of blood when right ventricle contracts
• aortic valve prevents backflow of blood when the left ventricle contracts
• Blood flows through the body in one direction only due to valves in the veins preventing it flowing backwards.
• Veins have valves to stop blood flowing backwards when the heart relaxes.
• Blood flows in the Heart through the vena cava and pulmonary vein
• Blood in the pulmonary vein is oxygenated as it has travelled from the lungs
• two atriums contract letting the blood flown to the ventricles
• Pacemaker regulates heart beat
• Pacemaker is small electrical impulses which spread throught the thick stomach wall causing it to contract
• Artifical pacemaker sends an electric current to our heart to remind it to contact
• pulmonary artries carries deoxygenated blood. Pulmonary vein carries oxygenated blood
• Coronary artery encircles the heart
• Left ventricle haa thicker walls as it pumps blood around tthe bodyy
• Aorta carries oxygenated blood
• Pacemaker cells r found in the right atrium
• Capillaries exchange nutrientts and oxygen
• arteries are strong and elastic to bear high blood pressure
• thicker luman than muscles:artery
• After blood is transorted through The body it entere the capillaries
• Exchange substances with our cells and transport them around the body:capillaries
• Nutrients oxygen and waste products are exchanged in capillaries
• Single thick walls and permeable:capillaries