Biol 216 9 Circulatory System 33-64.pdf

Biol 216 9 Circulatory System 33-64.pdf - Clicker The...

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5/24/17 1 Clicker ? The lub-dup sound you hear through a stethoscope placed over the heart is the _____. A. Muscles of the heart contracting and relaxing B. Valves being forced shut C. Blood rushing into the next chamber D. Heart bumping against the sternum when it contracts 5/24/17 33 Clicker ? The lub-dup sound you hear through a stethoscope placed over the heart is the _____. A. Muscles of the heart contracting and relaxing B. Valves being forced shut C. Blood rushing into the next chamber D. Heart bumping against the sternum when it contracts 5/24/17 34
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5/24/17 2 The Mammalian Heart A four-chambered pump Two atria at top of heart Two ventricles at bottom of heart Atrioventricular (AV) valves between atria and ventricles Semilunar (SL) valves between ventricles and aorta / pulmonary arteries Blood is pumped into two separate circuits Pulmonary circuit Systemic circuit 5/24/17 35 The Human Heart AV Valve AV Valve 5/24/17 36
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5/24/17 3 Valves 5/24/17 37 Note: Pulmonary vein has oxygenated blood Pulmonary artery has deoxygenated blood A rteries carry blood a way from the heart T B 5/24/17 38
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5/24/17 4 Even though the amounts of blood have to be the same in the two systems (otherwise blood would pool in one or the other) the pressures can be different. Do not want high pressures in our lungs… don’t want to risk having fluid leak out into our lungs (pulmonary edema) But we do want high pressure to our body as our bodies have a high need for sustained blood flow to maintain our activity. Advantage of separate systems (pulmonary/systemic) 5/24/17 39 Circulation-Blood Vessels Blood leaves the heart in large arteries Branch into smaller arterioles Arteriolesdeliver blood to capillary networks Capillaries exchange substances between blood and interstitial fluid Small venules collect blood from capillaries Join into larger veins that return blood to heart 5/24/17 40
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5/24/17 5 Design of transport systems 1.
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