Cardiovascular System review

It returns through the systemic veins into the right

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It returns through the systemic veins into the right atrium and flows into the right ventricle Blood Volume Composition 1. Plasma --Water, salts, nutrients, proteins 2. Cells etc. --Red blood cells = erythrocytes --White blood cells = leukocytes (Various types) --Platelets = cell fragments Hematocrit ~ % red cells
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Heart Sounds Ascultation or listening to the heart with a stethoscope allows us to hear two sounds: 1. LUB = the sound when the AV valves close 2. DUB = the sound when the semilunar valves close The quality of these sounds allows a trained health care provider to assess certain aspects of heart function 1. A murmur during the lub sound would indicate a backflow of blood from the ventricle to the atrium Conducting System The conducting system of the heart consists of several components. It consists of a group of cells that are located in the upper wall of the right atrium known as the SA node. 1. The feature of these cells is that they have the fastest inherit rhythm of contraction. 2. Also known as the pacemaker cells. In order for contraction to happen first there has to be electrical action Cardiac cells don’t need ______ cells The electrical activity of the cardiac cells starts the contractions SA node depolarizes has electrical activity and that get transmitted through the right atrium and gets crossed through the left atrium AV node is a little slow but it is in contact with Bundle fibers Purkinje fibers
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