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- Part of the autonomic nervous system
- Weighs 1.5lbs
- Located behind the Sternum (Breast Bone)
- Pumps approx. 3 oz. of blood every beat, beats approx. 60-100 times per minute, and beats approx 85,000 times per day
- About the same size as fist
- An average adult body has about 5 qrts of blood
- All the blood vessels in the body joined together would stretch 62,000 miles or 2 1/2 times around Earth
Purpose of the Heart
- Provides oxygen and nutrients (fuel) by pumping blood to the body
- Rids waste products (Lactate and CO2) from blood by pumping blood to lungs
- Works as a pump - keeps us alive
Tissue of the Heart
- PERICARDIUM - thin tissue or sac that encases the heart (Attached to sternum, ribs, and internal organs)
- EPICARDIUM - outside layer of the heart (like skin); very thin tissue
- ENDOCARDIUM - inside layer of the heart; very thin tissue
- MYOCARDIUM - thickness of the heart wall (muscle); 90% of the heart tissue
Chambers of the Heart
- ATRIUMS - right and left; top chambers of the heart; receiving chambers
- VENTRICLES - right and left; bottom chambers of the heart; pumping chambers
- SEPTUM - wall that separates the left side of the heart from the right side
- VESSELS - carry blood to and from the heart and body (Vena Cava, Pulmonary Trunk/Artery, Pulmonary Veins, Aorta)
- VALVES - Tricuspid Valve, Bicupid Valve/Mintral Valve, Pulmonary Valve, Aortic Valve.
Heart's Circulatory System
CIRCULATORY SYSTEM OF THE BODY: Aorta - Artery - Arteriotes - Capillaries - Venules - Veins - Vena Cava
The heart has its own circulatory system. The above does NOT nourish the heart.
The Coronary Arteries Deliver Oxygen to the Heart
- Left main coronary artery = delivers oxygen to left side of the heart
- Circumflex = delivers oxygen to the posterior side (goes back down) and wraps around back of heart
- Right main coronary artery = delivers oxygen to the right side of the heart
What Can Happen If Blood Flow and Oxygen Are Slowed or Cut Off?
- Ischemia - lack of oxygen to the heart muscle
- Angina Pectoris - Pain caused by lack of oxygen to the myocardium (cells weaken, but do not die)
- Myocardial Infarction - (Heart Attack) When the heart tissue cut off from oxygen dies
- Massive Heart Attack - When oxygen is cut off to the left side of the heart the person usually dies
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