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Anatomy of the Heart. Video. Heart Shape and Make-up . Nine (9) inches long x three (3) inches wide. Size of a fist Triangular Involuntary striated muscle tissue Only found in this organ. Beats 60-100 times per minute 2.5 billion times during an average lifespan. .

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heart shape and make up
Heart Shapeand Make-up
  • Nine (9) inches long x three (3) inches wide.
    • Size of a fist
    • Triangular
  • Involuntary striated muscle tissue
    • Only found in this organ.
  • Beats 60-100 times per minute
    • 2.5 billion times during an average lifespan.
heart location
Heart Location
  • Base--attached to several large blood vessels and lies beneath the second rib.
  • Apex—
    • at the fifth intercostal space
    • Points towards the left
  • Located within the mediastinum, bordered laterally by the lungs, posterior is the backbone, and anterior is the sternum
pericardial cavity
Pericardial Cavity
  • Pericardium
    • Located between the parietal and visceral layers
  • Fluid filled sack that surrounds the heart
    • Pericardial fluid
    • Several functions
      • Keeps the heart contained in the chest cavity
      • Prevents the heart from over expanding when blood volume increases
      • Prevents friction (rubbing with beats)
layers
Layers
  • Made up of three (3) distinct layers:
  • Outer epicardium
  • Myocardium
  • Inner endocardium
epicardium
Epicardium
  • Corresponds to the visceral pericardium.
  • Functions as an outer protective layer.
  • Serous membrane that consists of connective tissue covered by epithelium.
  • Includes blood capillaries, lymph capillaries, and nerve fibers.
myocardium
Myocardium
  • Relatively thick.
  • Consists largely of cardiac muscle tissue responsible for forcing blood out of the heart chambers.
  • Muscle fibers are arranged in planes, separated by connective tissues that are richly supplied with blood capillaries, and nerve fibers.
endocardium
Endocardium
  • Consists of epithelial and connective tissue that contains many elastic and collagenous fibers.
  • Connective tissue also contains blood vessels and some specialized cardiacmuscle fibers called Purkinje fibers.
  • Lines all of the heart chambers and covers heart valves.
  • Is continuous with the inner lining of blood vessels--endothelium.
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Handout

vena cava
Vena Cava
  • Superior Vena Cava
    • Bringing de-oxygenated blood
      • Upper body to the right atrium of the heart
  • Inferior Vena Cava
    • Bringing de-oxygenated blood
      • Lower body to the right atrium of the heart
chambers
Chambers
  • Atria
    • Two chambers at the top
    • Right
      • Receives deoxygenated blood from the superior and inferior vena cava
    • Left
      • It receives oxygenated blood from the pulmonary veins
chambers1
Chambers
  • Ventricles
    • Two chambers at the bottom
    • Right
      • It receives deoxygenated blood from the right atrium
    • Left
      • It receives oxygen richblood from the left atrium
    • Video
coronary arteries
Coronary Arteries
  • Coronary arteries supply blood to the heart muscle
    • oxygen-rich blood to function
    • oxygen-depleted blood must be carried away
    • consist of two main arteries
      • the right and left coronary arteries.
valves
Valves
  • Tricuspid
    • valve is between the right atrium and right ventricle.
  • Pulmonary
    • valve is between the right ventricle and the pulmonary artery.
valves1
Valves
  • Mitral (Bicuspid)
    • valve is between the left atrium and left ventricle.
  • Aortic
    • valve is between the left ventricle and the aorta.
  • Each valve has a set of flaps (also called leaflets or cusps). When working properly, the heart valves open and close fully.
vessel valves
Vessel Valves
  • Pulmonary Valve
    • semilunar valve of the heart that lies between the right ventricle and the pulmonary artery and has three cusps.
  • Aortic Valve
    • It lies between the left ventricle and the aorta
    • video
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Handout

importance of coronary arteries
Importance of Coronary Arteries
  • Coronary artery disorder or disease
    • Reducing the flow of oxygen and nutrients to the heart
      • leads to a heart attack and possibly death.
      • Video
    • Atherosclerosis (a build-up of plaque in the inner lining of an artery causing it to narrow or become blocked) is the most common cause of heart disease.
vessels
Vessels
  • Video
  • Superior Vena Cava
  • Inferior Vena Cava
  • Aorta
  • Pulmonary Artery
  • Pulmonary Vein
aorta
Aorta
  • Largest single blood vessel in the body
    • diameter of your thumb
    • carries oxygen-rich blood from the left ventricle to the various parts of the body
  • Aortic Arch
    • Top curve of the aorta
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Handout

pulmonary artery
Pulmonary Artery
  • Vessel transporting de-oxygenated blood from the right ventricle to the lungs
  • A common misconception is that all arteries carry oxygen-rich blood
    • It is more appropriate to classify arteries as vessels carrying blood away from the heart.
pulmonary vein
Pulmonary Vein

Vessel transporting oxygen-rich blood

from the lungs to the left atrium

A common misconception is that all

veinscarry de-oxygenated blood

it is more appropriate to classify veins as vessels carrying blood to the heart

Video-blood flow

Video

entire cycle
Entire Cycle
  • video- blood flow
  • Lyrics
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Handout