Lecture 2 - II: Functions of Cirtculation Cyanosis: blue...

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II: Functions of Cirtculation Cyanosis: blue baby, if walls between the ventricles not completely closed. So some deoxygenated blood seeps from right centricle into left ventricle. 1.) Flow of heart a. Systole: contraction of atria at .1 seconds and strong contraction of ventricles at .3 seconds. The Systeole phase is has the most hydrostatic pressure in heart and body b. Diastole: Atria and ventricles relax; .4 seconds. 120/70 mm Hg 2.) Control of Heartbeat. a. Heart muscle can contract without brain signals. b/c of sinoatrial node (pacemaker) b. Cardiac muscle: intercollated discs. b.i. Connections between cardiac muscle = gap junctions (proteins c. AV node receives the signal from SA node. Delays 1/10 second, and then passes the signal to bottom of ventricles to contract. b/c blood needs to enter ventricle. d. ECG: strongest signal is from contraction of ventricles e. Heart beat is heard b/c of atrioventricular valves been shut, second beat is semilunar valves shutting 3.) Blood Pressure:
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Lecture 2 - II: Functions of Cirtculation Cyanosis: blue...

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