Coronary heart disease is when plaque builds up inside the coronary arteries. The heart is a muscular pump located in the mediastinum that keeps blood flowing through the vessels. Coronary heart disease can develop because of hereditary or old age. Another way it develops is because of obesity, smoking, lack of exercise, anxiety, stress, and aggression. The pulmonary and systemic circuits carry blood to the organs in the body. The pulmonary circuit is on the right half of the heart. The pulmonary circuit carries blood to the lungs for gas exchange and returns it to the heart. It pumps oxygen poor blood into the pulmonary trunk, which immediately divides into the right and left pulmonary arteries. The pulmonary arteries transport blood to the air sacs of the lungs, where carbon dioxide is unloaded and oxygen is picked up. The oxygen rich blood then flows by the pulmonary veins to the left side of the heart. …show more content…
Blood passes downward posterior to the heart which then supplies the head, neck, upper limbs, abdominal cavities, and smaller arteries to other organs before reaching the lower limbs. After all organs have received blood the deoxygenated blood returns to the right side of the heart. The deoxygenated blood gets back to the heart by two veins. The superior vena cava and the inferior vena cava where the process begins again. The sole purpose of blood is to transport substances from place to place in the body. Blood has three main functions which is to transport, protect, and regulate. Blood carries oxygen from the lungs to all the body tissue which aides in transportation. Blood limits the spread of infection which helps protect the body. By absorbing or giving off fluid under different conditions, the blood capillaries help stabilize fluid distribution in the body which helps regulate the