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BIOL 1010 (76)
Chapter 27

BIOL 1010 Chapter 27: Topic 27.4

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Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

OD88729 Bio 1010 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 Heartrateisalsoinfluencedbyhormones,suchasadrenaline(oftenheightened during high stress) An increased heart rate providesmore blood to muscles that may be needed to “fight or flee” 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 C2 increases in the blood as a person exercises, causing pH to drop. An accelerated heart rate enhances delivery of oxygen rich blood to body tissue and CO 2rich blood to the lungs for removal of 2O (Breathing rate is also speeded up by this mechanism.) – The circulatory system transports different nitrogenous wastes in animals depending on evolutionary history and habitat Chapter 27 Review Circulatory system’s role in transporting oxyge
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