The Heart

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  1. Heart Facts
    • 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
  2. 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
  3. 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
  4. 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.
  5. 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.
  6. 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
  7. 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
Card Set:
The Heart
2013-01-19 01:40:57
Fitness Wellness

Fitness and Wellness
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