“ Physiological properties of the heart ”

1. “Physiological properties of the heart”

2. Contents: 1. Morphological and functional properties of the heart 2. Automatism 3. Excitability 4. Conductibility 5. Contractility 6. Pump work of the heart 7. Heart sounds 8. Echocardiography

5. Automatisity • Is a property of heat to produce the bioelectrical impulses • SA-node – 60-90 /min • AV – node – 40-60 /min • Hiss bungle – 30-40 /min • Purkinje fibers - <20 /min

6. Automatism

7. Active potentialof contractiveheart cells

8. Phases of active potential • 0 – depolarization • 1 – beginning rapid repolarization • 2 – slowly repolarization or plateau • 3 – ending rapid repolarization • 4 – rest period.

9. - + + + + + Membrane - - - - - +

10. Active potential of apitalcardiomyocytes 0 – rapid depolarization; 1 – rapid beginning repolarization; 2 – slowly repolarization; 3 – rapid spontaneosly repolarization; 4 – spontaneosly diastolic depolarization.

11. - + + + + + Membrane - - - - - +

12. Active potential, contraction, excitability of heart cells 4 – absolute refractivity; 5 – relative refractivity; 6 – period of increase excitability; 7 - exaltation

13. Conductive system of heart 2 – SA node; 3 – Bachman tract; 4 – tracts of Bachman, Venkebach, Torel 6 – AV node 7 – Hiss bungle 8 – right leg of Hiss bungle 9 – anterior brunch of left leg of Hiss bungle 10 – posterior brunch of left leg of Hiss bungle 11 - Kent bungle 12 – Jams bungle 13 - Meacham bungle

15. Thank you!