Heart

• The aorta carries oxygenated blood from the left ventricle to the rest of the body
• The pulmonary artery carries deoxygenated blood from the right ventricle to the lungs
• The pulmonary vein carries oxygenated blood from the lungs back into the heart
• The vena cava brings deoxygenated blood back into the heart from the rest of the body
• The atria are thin-walled chambers that receive blood from veins.
• The coronary circulation supplies blood to the heart muscle itself
• Cardiac output = stroke volume x heart rate
• Blood pressure is determined by two factors: cardiac output and total peripheral resistance
• Heart rate is the number of contractions per minute (usually about 60–100 beats/min)
• The right atrium receives deoxygenated blood from the body and pumps it into the right ventricle
• The left atrium receives oxygenated blood from the lungs and pumps it into the left ventricle
• The left ventricle pumps oxygenated blood through the aorta to the rest of the body
• The right ventricle pumps deoxygenated blood through the pulmonary artery to the lungs
• The heart valve is a flap of tissue that prevents backflow of blood into the heart
• Valves prevent backward flow of blood within the heart.
• Ventricles are thicker-walled chambers that pump blood out of the heart
• Heart diagram :

  
• Pacemaker cells use small electrical impulses spread through the muscular walls causing reg contractions
• Any artery carry blood away from the heart to the body.
• Any Vein carry’s blood to the heart
• Pacemaker cells are found in the right atrium