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ppt on heart

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ppt on heart

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ppt on heart

  1. 1. STRUCTURE AND FUNCTION OF HUMAN HEART HEART
  2. 2. INTRODUCTION  The heart is a muscular organ about the size of a closed fist that functions as the body’s circulatory pump. It takes in deoxygenated blood through the veins and delivers it to the lungs for oxygenation before pumping it into the various arteries (which provide oxygen and nutrients to body tissues by transporting the blood throughout the body). The heart is located in the thoracic cavity medial to the lungs and posterior to the sternum.
  3. 3.  On its superior end, the base of the heart is attached to the aorta, pulmonary arteries and veins, and the vena cava.  The inferior tip of the heart, known as the apex, rests just superior to the diaphragm.  The base of the heart is located along the body’s midline with the apex pointing toward the left side..
  4. 4. Structure of the Heart Wall The heart wall is made of 3 layers: epicardium, myocardium and endocardium. Epicardium. The epicardium is the outermost layer of the heart wall and is just another name for the visceral layer of the pericardium. Myocardium. The myocardium is the muscular middle layer of the heart wall that contains the cardiac muscle tissue. Endocardium. Endocardium is the simple squamous endothelium layer that lines the inside of the heart. The endocardium is very smooth and is responsible for keeping blood from sticking to the inside of the heart .
  5. 5. FUNCTIONING OF HEART
  6. 6. The heart circulates blood through two pathways: the pulmonary circuit and the systemic circuit. In the pulmonary circuit, deoxygenated blood leaves the right ventricle of the heart via the pulmonary artery and travels to the lungs, then returns as oxygenated blood to the left atrium of the heart via the pulmonary vein. In the systemic circuit, oxygenated blood leaves the body via the left ventricle to the aorta, and from there enters the arteries and capillaries where it supplies the body's tissues with oxygen. Deoxygenated blood returns via veins to the venae cavae, re-entering the heart's right atrium.
  7. 7. The Pathway of Blood Flow Through the Heart https://www.youtube.com/watch?v=Rj_qD0SEGGk Valves prevent backflow, keeping the blood flowing in one direction through the heart.

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