BIOL 1002 Chapter : Circulation Chapter 32 Part 2 Of 2

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15 Mar 2019
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Circulation (chapter 32) part 2 of 2: controlling the pump. The structure of cardiac muscle- electrical signals are spread rapidly by gap junctions. The heart muscles must beat in smooth coordinated contractions: keep blood moving and __avoid random contractions _____________________ (fibrillations) These coordinated contractions require a __pacemaker_________________: pacemaker is an area of muscle that sets the pace for the other muscle cells. The __sinoatrial node_______________________ (sa node) is the heart"s primary pacemaker (fig. It is a small mass of muscle cells in the wall of the right atrium. It generates electrical impulses that cause both atria to contract. The sa node pacemaker maintains a steady beat of ___60-100__________ beats/minute: heart rate & influences, at rest, then nerve impulses are low, heart rate slows to about 50-70 beats/minute, nervous impulses and hormones can influence heart rates. Exercise or stress can accelerate the heart rate. __plasma____________________- 90% water with dissolved substances: proteins, hormones, nutrients (glucose, vitamins, amino acids, lipids, o2)

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