Cardiovascular Conditions

Cardiovascular Conditions - Cardiovascular Conditions VS...

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Unformatted text preview: Cardiovascular Conditions VS 441 Review of normal structure and function • Double pump—4 chambers – Left side sends oxygenated blood to tissues – Right side sends deoxygenated blood to lungs Review of normal structure and function • Deoxygenated blood from systemic circulation vena cava right atrium right ventricle pulmonary arteries lungs pulmonary veins left atrium left ventricle aorta systemic circulation Review • Heart walls—contract and move blood • Three layers— – Endocardium – Myocardium – Epicardium • Entire heart covered by pericardium Myocardium • Cardiac muscle--responsible for contraction • Stimulated by electrical impulses • Thinner in atria than ventricles • Thinner in right ventricle than left Cardiac cycle • Coordinated contraction of right and left atria and ventricles • Divisible into 2 periods: – Diastole-relaxation; chambers fill with blood – Systole-contraction; chambers pump blood • Heart valves—function to prevent backflow of blood during cycle Cardiac cycle • Sequence 1. Atria in diastole and are filling with blood; ventricles have just completed systole and are relaxing. Blood is flowing from atria into ventricles. 2. Atria contract and move contents into ventricles....
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Cardiovascular Conditions - Cardiovascular Conditions VS...

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