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Chapter 13

Functions of Cardiovascular system Transports: 1.O & nutrients to cells 2.waste from cells to liver&kidney 3.hormones,immune cells,clotting proteins to specific targets
Weight of heart 250-350 grams
Valves of heart 1. Atrial Ventricular Valves 2.Semilunar valves(between BV&ventricles)
Functions of Valves prevents back flow, have passive opening depending on pressure
Pulmonary Circut Supplied by heart, goes to lungs,blood pumped by R ventricles to lungs & returns from lungs to L atrium
Systemic Circut supplies blood to body, supplied by L heart, blood pumped from L Ventricles to systemic tissues, then back to R atrium
Blood path L Ventricle,Aorta,systemic circuit, vena cavae, R atrium, R ventricle, pulmonary veins, L atrium,L ventricle
Autorhythmicity Ability of heart to generate its own rhythm of contraction
Auto-rhythmic cells Small % of heart cells that can provide and coordinate rhythm to heart beat
Pacemaker Cells Can spontaneously depolarize a membrane potential to generate AP * can coordinate rhythm to beat
conduction fibers can regularly conduct AP initiated by pacemaker cells to rest of heart *speed is 4m per sec. *muscle cells is .4m per sec
SA node can generate 17-18 AP per min *determines heart rate
AV node 14-16 AP per min *back up of SA node *ECG to detect heart problems
Systole Ventricle contraction *blood pumped out of heart
Diastole Ventricle relaxation *blood fill into heart
Stroke Volume volume of blood ejected by ventricles during ea. beat *70mm normal stroke volume
When do AV vales open when pressure in atria is larger than pressure in ventricles
When do semilunar vales open when pressure in ventricle is larger than pressure in arteries
1st heart sound "lubb" caused by closure of AV valve
2nd heart sound "dubb" caused by closure of semilunar valve
Cardiac output Volume of blood pumped by ea. ventricle per min. *5L per min @ rest
intrinsic regulation situated within the heart
Extrinsic regulation originating outside the heart *includes nervous and hormonal mechanisms
Created by: izis



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