Heart Anatomy and Heart Facts

Heart Facts
• Size: slightly larger than a fist
• Location: the middle of the chest between the lungs
• Lifetime beats (expands and contracts): 3.5 billion times in a long life
• Daily beats: 100,000 times each day (on average)
• Volume pumped: 2,000 gallons of blood each day (on average)
• Chambers: 4 (left atria, right atria, left ventricle, right ventricle)
• Septum: 1 wall of muscle separating the left and right sides of the heart
• Function: supplies organs and tissues with oxygen and nutrient-rich blood

The Cardiovascular System Includes
• Heart muscle (myocardium) that is involuntary in nature
• Heart valves (one-way “doors” that control the direction that blood flows)
• An electrical conduction system (regulates the heart beat)
• Blood (8-12 pints or 1 to 1.5 gallons in humans)
• Coronary arteries (vessels that carry blood to the muscle of the heart itself)
• Arteries (vessels that carry blood out to the body)
• Veins (vessels that return blood from the body back to the heart)
• Pericardium (a protective, sac-like, double-layered membrane around the heart)

The Heart Valves
The Heart’s Electrical Conduction System


Texas Heart Institute www.texasheartinstitute.com/HIC/Anatomy/anatomy2.cfm