Circulatory System Structures, Functions, and Disorders
Circulatory System
Obj: Explain the structure of the heart
1
Structure of the Heart
Size, shape and location
1. Size of a closed fist 2. In thoracic cavity 3. Apex: the tip of the heart that lies on the diaphragm and points to the left of the body 4. Four chambers
2
Layers
1. Pericardium: Sac (membrane) that surrounds the heart
2. Myocardium: muscular layer of the heart
3. Endocardium: smooth membrane that lines the inside of the heart and heart valves
4. Septum: partition between the R and L sides of the heart
3
Structures to and from heart
1. Superior and inferior vena cavaveins that bring blood from the body to the heart
2. Pulmonary artery and vein- take blood to the lungs and return it to the heart
3. Aorta: large artery
that blood enters as it
leaves the L ventricle
of the heart
4
Chambers and valves
1. Atria (atrium): have two, top chambers of the heart
2. Ventricles (ventricle): have 2, bottom chambers of the heart
5
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