Summer Lecture Circulation 1 final

P map 80 13120 80 93 mm hg 90760 012

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Unformatted text preview: thmic myocardial cells (pace maker cells) • Sympathe(c s(mula(on increases Na+ permeability - Think about ENa • Parasympathe(c s(mula(on increases K+ permeability - Think about EK ACer a heart aEack, give beta- blockers (antagonists to β1 norepinephrine/epinephrine receptors) this slows the heart rate, reducing O2 demand of heart muscle Friday, July 20, 12 Combining beta Blockers and Ar(ficial Pacemaker to Set Heart Rate • Beta- blocker: target beta1 receptors of norepinephrine and epinephrine in S- A node myocardial cells – Blocks sympathe(c s(mula(on of heart • Without sympathe(c s(mula(on, res(ng heart rate is low ~50 bpm – Implanted pacemaker raises heart rate to the desired level 21 Friday, July 20, 12 Model of the Cardiovascular System We need to consider how blood is forced/moves through blood vessels Pulmonary circula>on Systemi...
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