BIO 12 Lecture Notes - Lecture 16: Endocardium, Extracellular Fluid, Thoracic Vertebrae
14 Sep 2020
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Contains the pump (heart), interconnected tubes (blood vessels: veins, arteries, capillaries), extracellular fluid and cells (blood) A boot-shaped hollow muscular organ lying within the pericardium. Located in the left side of the mediastinum. Covers and protects the heart from trauma. A double sac of serous membrane covering and protecting the heart. Tough fibrous outer membrane that attaches anteriorly to the lower heart of the sternum; posteriorly to the thoracic vertebrae and inferiorly to the diaphragm. Thin, inner layer that closely adheres to the heart. Pericardial space where pericardial fluid flows; 5-20 ml. Cardiac conduction (electrical impulses/stimulation) system initiates and regulates the cardiac cycle (one complete heartbeat) Responsible for the contraction of the heart. Receives deoxygenated blood from the peripheral circulation. Collects deoxygenated blood coming from the peripheral system (svc and ivc) Receives or collects oxygenated blood from the lungs. Receives oxygenated blood from the pulmonary system. Ejects/pumps/propels/moves/transports deoxygenated blood going to the pulmonary circulation/system, specifically, the lungs.
