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37 Cards in this Set
- Front
- Back
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Number of cells in the body
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70 - 80 trillion
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Cardiovascular system
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Supplies continous supply of oxygen and nutrients to the calls
Removes accumulated waste products from the body |
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CVS
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Cardivascular System
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CVS consists of...
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Heart
Blood Vessels |
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Blood vessels
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Arteries - carry blood away from the heart
Veins - carry blood toward the heart Capillaries - tiny blood vessels that join arteries (arterial) and veins (venous) systems |
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Oxygenated blood
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Blood saturated with oxygen
Occurs in the lungs Blood then travels to the organs |
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Deoxygenated blood
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Blood released of oxygen
Through the veins to the heart |
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Heart Structure
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Surrounded by a fluid filled sac - Pericardium
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Heart
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Located deep in the thoracic cavity
Posterior to the sternum Left of the mid-line |
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Pericardium
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Fluid filled sac surrounding the heart
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Number of cells in the body
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70 - 80 trillion
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Cardiovascular system
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Supplies continous supply of oxygen and nutrients to the calls
Removes accumulated waste products from the body |
|
|
CVS
|
Cardivascular System
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CVS consists of...
|
Heart
Blood Vessels |
|
|
Blood vessels
|
Arteries - carry blood away from the heart
Veins - carry blood toward the heart Capillaries - tiny blood vessels that join arteries (arterial) and veins (venous) systems |
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Oxygenated blood
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Blood saturated with oxygen
Occurs in the lungs Blood then travels to the organs |
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Deoxygenated blood
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Blood released of oxygen
Through the veins to the heart |
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Heart Structure
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Surrounded by a fluid filled sac - Pericardium
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Heart
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Located deep in the thoracic cavity
Posterior to the sternum Left of the mid-line |
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Pericardium
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Fluid filled sac surrounding the heart
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Interior of the Heart
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Four chambers
Right and Left Atria Right and Left Ventricles Separated by the Septum |
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Cusps attached to the heart walls by...
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Chordae tendineae
Strong, fibrous cords Ensures that valves close tightly, preventing backflow |
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Septum
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Separates the Left and Right sides of the heart
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Atrioventricular valve
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Allow blood to flow from Atria to Ventricles
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Right Atrioventricular Valve
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Tricuspid Valve
Three triangular flaps called Cusps |
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Left Atrioventricular valve
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Bicuspid valve
Mitral valve Only two cusps |
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Semilunar Valve
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Allow blood to flow from the ventricles to the arteries
Half moon shaped valves |
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Pulmonary Semilunar valve
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Allows blood to flow from the Right Ventricle into the Pulmonary Artery
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Aortic Semilunar Valve
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Allows blood to flow from the Left Ventricle into the Aorta
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Heart walls
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three layers
Myocardium - thick middle wall Endocardium - thin inner layer Epicardium - Outer layer |
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Epicardium
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Outer layer of the heart
Made of connective and epithelial tissue |
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Heart is surrounded by...
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Pericardium
Sac filled with pericardial fluid Outer covering is parietal layer Inner covering is visceral layer (AKA epicardium) |
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Conduction system performs what function?
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Beats until it runs out of oxygen because it has its own electrical system
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Parts of the Conduction System
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Sinoatrial Node - SA node
Atrioventricular Node - AV node Atrioventricular bundle - AV bundle Left and right bundle branches Purkinje fibres |
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How conduction system works
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SA node initialtes electrical impulse that cause contraction
Impulses transmitted to the AV node AV node causes right & left atria to contract simultaneously next beat, AV node sends signal down to R & L bundle branches to the Purkinje fibers which cause R&L myocardium to contract the ventricles |
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Another name for the SA Node
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Pacemaker
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EKG shows...
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P Waves - atrial contractions
QRS Waves - ventricular contraction T Waves - ventricular recovery |
