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The Circulatory System The Heart

The Circulatory System The Heart . Chapter 20. Life without the circulatory system …… ???. Functions of the Cardiovascular System. Circulates Blood through the Body Delivers Oxygen & Nutrients to Cells Picks up CO2 & other Waste From Cells Helps Maintain Homeostasis

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The Circulatory System The Heart

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  1. The Circulatory SystemThe Heart Chapter 20 Life without the circulatory system …… ???

  2. Functions of the Cardiovascular System • Circulates Blood through the Body • Delivers Oxygen & Nutrients to Cells • Picks up CO2 & other Waste From Cells • Helps Maintain Homeostasis • Helps Regulate Body Temperature • Helps maintain pH of Blood & Body • Helps fight infections • Carries immunities for diseases

  3. 2 Circulatory Pathways : • Pulmonary Pathway • To lungs with CO2 • Systemic Pathway • To the rest of the Body with O2

  4. Systemic Pathwayincludes….. • Coronary • To heart via Coronary Arteries • Renal • To Kidneys • to be cleaned • Portal • To digestive system • to pick up nutrients • Hepatic • To liver • to store nutrients

  5. Size & Location of the Heart • Size: • 12 cm long • 9 cm wide • 6 cm thick • Location: • In Pericardial cavity in between lungs • Area: Mediastinum – between two pleural cavities • 2/3 sits on the left side

  6. Pericardium • Double lining of the pericardial cavity • Visceral pericardium • Inner layer • Parietal Pericardium • Outer layer • Pericardial cavity • In between the parietal & visceral layers • Contains pericardial fluid

  7. Pericardium

  8. Wall Anatomy of the Heart 3 layers: • Epicardium • Outer layer • Part of the Visceral Pericardium • Covers the heart • Myocardium • Middle layer • Muscular wall • Concentric layer of cardiac muscle tissue • Endocardium • Inner layer • Simple squamous epithelium

  9. The 3 Layers of the Heart

  10. External Heart Left & Right Auricle Left & Right Atrium Left & Right Ventricle Apex Base Coronary Vessels Arch of Aorta Pulmonary Truck Vena Cava Interventriclular Sulcus Fat

  11. Arch of Aorta External Heart (Anterior) Pulmonary Artery Superior Vena Cava Pulmonary Trunk Right Auricle / Right Atrium Left Auricle/ Left Atrium Base of the Heart Coronary Vessels Apex of the Heart Interventriclular Sulcus Myocardial Blood Flow

  12. Arch of Aorta External Heart (Posterior) Pulmonary Artery Pulmonary Vein Pulmonary Vein Vena Cava Apex

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