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MT30-Histology Art AB 4 years, 1 month ago 
The heart wall
a. Epicardium
aka visceral pericardium is a thin serous membrane that constitutes the smooth, outer surface of the heart.
b. Myocardium
The thick middle layer is composed of cardiac muscle cells and is responsible for the heart’s ability to contract.
c. Endocardium- smooth inner-surface of the heart chambers consists of simole squamous epithelium over a layer of connective tissue
4chambers
1. Deoxygenated blood enters (1) right atrium through Superior and Inferior Vena Cava
2. Blood enters (2) right ventricle through tricuspid valve
3. Blood exits right ventricle through pulmonary valve and enters pulmonary artery
4. Left and right pulmonary arteries send blood to lungs, where gas exchange occurs
5. Oxygenated blood returns to heart via the pulmonary veins ïƒ enters (3) left atrium
6. Blood enters (4) left ventricle through mitral valve
7. Blood exits left ventricle through aortic semilunar valve to enter aorta
8. Aorta distributes blood to body