7 Heart sounds (lub-dup) are associated with closing of heart valves. First sound occurs as AV valves close and signifies the beginning of systole.Second sound occurs when SL (semilunar) valves close at the beginning of ventricular diastole.
9 Types of Blood Vessels Arteries -Carry blood away from the Heart -The Aorta is the largest arteryVeins-Carry blood to the Heart-Veins contain valves-The Vena Cava is the largest veinCapillaries-Known as the “Distribution Pipes”
11 Blood accounts for 8% of body weight. Its volume in healthy adult males is 5-6 liters.The blood has many functions:transports nutrients to cells throughout bodydelivers oxygen, removes carbon dioxidecarries hormonesprotecting the body from infection
12 The Composition of Blood The Plasma (Fluid) makes up 55% of the blood volume.The Solids (Cells) make up 45% of the blood volume.
13 Blood Plasma 97% Water Other 3% -Antibodies and Proteins - Nutrients and Wastes
14 Blood Solids Red Blood Cells -Carry oxygen -Contain Hemoglobin White Blood Cells-Attack bacteria & other invadersPlatelets-Control the blood clotting process