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Heart Anatomy

Heart Anatomy. Ch. 20-1. The Heart. Ch. 20. Circulation. Pulmonary Eliminates carbon dioxide and oxygenates blood Involves lungs Systemic Delivers blood to body cells and carries waste away Involves the body. Heart. About the size of your fist

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Heart Anatomy

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  1. Heart Anatomy Ch. 20-1

  2. The Heart Ch. 20

  3. Circulation • Pulmonary • Eliminates carbon dioxide and oxygenates blood • Involves lungs • Systemic • Delivers blood to body cells and carries waste away • Involves the body

  4. Heart • About the size of your fist • Rests on the diaphragm, near the midline of the thoracic cavity • Surrounded by pericardium (protects) • Lies in the mediastinum, 2/3 is to the left of the midline

  5. Pericardium • Surrounds heart

  6. Pericardium • 3 layers • Epicardium – external layer • Thin, transparent layer; makes heart smooth and slippery • Myocardium – middle layer • Cardiac muscle, makes up bulk of heart • Responsible for pumping action • Endocardium – inner layer • Thin tissue, covers valves

  7. Chambers of the Heart • Atria – superior chambers (receive blood from veins) • Ventricles – inferior chambers (pump blood out of arteries) • Septum – separates right and left sides • Auricle – wrinkled, pouch-like structure on each atrium • Increases volume of blood each atrium can hold • Sulci – grooves on surface of heart; contain blood vessels and fat • Separates two chambers • Coronary sulcus – divides atria from ventricles • Anterior/posterior interventricularsulcus – divides ventricles

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