Weekk5_slides

Weekk5_slides - Electrocardiogram, dive reflex and heart...

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Electrocardiogram, dive reflex and heart rate variability
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The Cardiovascular system Blood flows through separate pulmonary and systemic circuits Each circuit begins and ends in the heart Heart beats 100,000 times/day Pumps about 8000 liters of blood ( 40- 55 gallons) Adult Heart beat 60-100 BPM Bradycardia<60BPM Tachycardia >100BPM Arteries Veins
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Step1: T=0 SA node activity and atrial activation Step2: T=50 ms Stimulus reaches the AV node Step3: T=150ms There is a 100ms delay at the AV node. Atrial contraction begins Step4: T=175ms The impulse travels along the interventricular septum via the AV bundle and the bundle branches to the purkinje fibers Step5: T=225ms The impulse is distributed by Purkinje fibers and relayed throughout the ventricular myocardium. Atrial relaxation. Completed ventricular contraction begins
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Cardiac Action Potentials 4 0 1 2 3 4
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Representative electric activity from various regions of the heart
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The Electrocardiogram Depolarization of Atria Depolarization of ventricles Repolarization of ventricles
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Duration (sec) Amplitude (mV) P wave 0.06-0.11 <0.25 P-R interval
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Weekk5_slides - Electrocardiogram, dive reflex and heart...

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