BIOL 1010 Chapter Notes - Chapter 27: Automated External Defibrillator, Sinoatrial Node, Chapter 27
14 May 2017
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Sa node unable to maintain a normal rhythm. Electrical shocks applied to the chest by a defibrillator may reset the sa node and restore proper cardiac function. Aed (automatic external defibrillator) are available at most places, and easy to use they are different than those used at a hospital. Cues that help to regulate the sa node. Two sets of nerves with opposite effects can direct this pacemaker to speed up or slow down, depending on physiological needs and emotional cues. Heart rate is also influenced by hormones, such as adrenaline (often heightened during high stress) An increased heart rate provides more blood to muscles that may be needed to (cid:862)fight or flee(cid:863) A slight decrease in blood ph causes the sa node to increase the heartrate. This control mechanism would benefit a person who is exercising because co2 increases in the blood as a person exercises, causing ph to drop.
