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Cardiovascular System Outline

Cardiovascular System Outline. Heart Beats 72 times a minute 100,000 times a day 3 Trillion times in a lifetime! Circulates about 5-7 liters of blood. Blood Vessels Arteries Veins. Structures. Functions. Transport nutrients and oxygen Transport waste to kidneys

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Cardiovascular System Outline

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  1. Cardiovascular System Outline

  2. Heart Beats 72 times a minute 100,000 times a day 3 Trillion times in a lifetime! Circulates about 5-7 liters of blood Blood Vessels Arteries Veins Structures

  3. Functions • Transport nutrients and oxygen • Transport waste to kidneys • Distribute hormones and antibodies • Help control body temperature and maintain homeostasis

  4. Heart • 2 Sided double pump • Is about the size of your fist • Lies in the thoracic cavity between the lungs

  5. Heart Tissue • Endocardium: smooth membranous lining inside the heart • Myocardium: thickest layer, muscle tissue that is contractile.

  6. Epicardium: outermost layer in the pericardium Pericardium: covers the outside of the heart Heart Tissue Cont’d

  7. Parts of the Heart • Divided into right and left sides • 2 chambers in each side, for a total of 4 chambers • Atrium: top, where blood enters • Ventricles: bottom, where blood leaves • Left and right sides separated by a partition called a septum

  8. Parts of the Heart Left Atrium Right Atrium Left Ventricle Right Ventricle Septum

  9. Heart Circulation • Pulmonary: Flow of blood between the heart and lungs • Systemic: Flow of blood between the heart and the cells of the body • Coronary: Flow of blood within the heart

  10. Blood flow • Review with heart anatomy

  11. Blood Flow • Vessels • Arteries carry blood away from the heart • Largest = Aorta • Heart muscle contractions pump blood through arteries Veins carry blood towards the heart Largest = Superior/Inferior Vena Cava Valves prevent blood from returning to heart skeletal muscle contractions move blood through veins

  12. Blood Flow Cont’d • Valves • control blood flow • Valve between left atrium and ventricle = bicuspid • Valve between right atrium and ventricle = tricuspid • Pulmonary and aortic valves stop the back flow of blood into the heart

  13. Review Blood flow: • 4 square blood flow color sheet

  14. Cardiac Conduction System • Electrical Impulses produce a wave that can be recorded on the ECG • Consists of • Sinoatrial (SA) node • Atrioventriclular (AV) node • Bundle of His (AV Bundle) • Bundle Branches • Purkinje Fibers (network)

  15. SA NODE • Located in the upper right part of the atrium • Is a natural pacemaker • Fires at a rate of 60 to 100 times per minute • The heartbeat starts in the SA node

  16. AV NODE • Located in the floor of the right atrium • Delays or slows the electrical impulse • Fires at a rate of 40 to 60 time per minute • Can take over if the SA node is not working

  17. Bundle of His • Located next to the AV node • Transfers the electrical impulse from the atria to the ventricles

  18. Bundle Branches • Located along the left and right side of the interventricular septum • Act as pathways or a fork in the road • Impulses in the bundle branch perform the important work of making the heart muscle contract

  19. Purkinje Network • Provide an electrical pathway for each of the cardiac cells • Activate the left and right ventricles simultaneously causing the ventricles to contract

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