Cardiovascular System By: Cristal Hernandez
The Cardiovascular System • This system contains the heart and the circulatory system. • It delivers blood to the body's tissues. • Every heartbeat is blood sent through the body that gives nutrients and oxygen to the cells. • Blood flows from the heart through thick arteries and up to small capillaries. • This system keeps every other system working!
The Heart • The heart is the key organ in the circulatory system that acts as a pump for the distribution of blood. • The body sends messages to the heart telling it when to pump more blood for oxygen and when to pump less. • It has four chambers beneath the walls and is located between the lungs towards the left of the chest cavity.
The Heart • The bottom of the heart consists of two chambers called the left and right ventricles that pump blood out of the heart. • TOP HALF: left and right atria. These two receive the blood entering the heart. • VALVES: - Pulmonary valve-separating the artery from the right ventricle. - Aortic valve- separating the aorta from the left ventricle. - These valves make sure blow does not flow backwards.
Circulatory System: Blood Vessels ARTERIES: • Arteries carry blood away from the heart and are the thickest of blood vessels built to keep the blood away from the heart. • Systemic circulation: - Oxygen-rich blood is pumped from the heart into the aorta. • Coronary arteries provide oxygen rich blood to the heart itself. • Pulmonary artery: - Carries oxygen poor blood - This artery helps the blood flow to the lungs, through the right ventricle, where the blood picks up oxygen. • As the arteries get farther from the heart the branches get smaller and smaller into arterioles. VEINS: • These carry blood back to the the heart and are thinner than arteries. • The superior and inferior vena cavae are the largest veins. • Capillaries connect the arteries and veins. Through them nutrients and oxygen are given to the cells and waste like carbon dioxide is removed making them a major part in the circulatory system.
Major Diseases Coronary Artery Disease: This is the most common heart disorder in adults and is caused by atherosclerosis. Deposits of fat, calcium and dead cells form on the inner walls of the coronary arteries and reduce blood flow. It is capable of forming a clot and causing heart attacks. Heart Failure: This disorder is where the heart is not capable of maintaining enough cardiac output for the tissues and have a normal metabolism. It is caused by straining of the heart and conditions that damage heart muscle.