The Heart
Location: Located between the 2nd and 5th rib, between vertebrae levels T4 and T9. Found within the pericardium in the middle mediastinum.
Overview:
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Circulation from the heart
Structure: Three layers (tunica): Intima, Media, and Adventitia. Different thicknesses of layers in vessels, most distinct in arteries. Veins have different sizes, arteries have muscular specializations and capillaries can only fit 1 blood cell at a time.
Great Vessels:
Coronary Circulation: Refers to the oxygenated blood sent to the heart for functional purposes. The left and right coronary arteries form the coronary sulcus that branches around the interventricular sulci converging to the apex of the heart. These drain through the cardiac veins emptying into the right atrium.
Conduction: The SA Node sends impulses to;
Cardiac Cycle:
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Lymphatic System:
Lymphatic System: A series of organs, vessels, and nodes that collect and filter excess tissue fluid (lymph) before returning it to the venous circulation
Function:
Drainage: Lymph drains back into venous circulation near the heart. However, the duct via which it drains depends on where in the body the lymph is.
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