Cardiology Heart Physiology II Muscle contraction and Pacemaker activity

>> YOUR LINK HERE: ___ http://youtube.com/watch?v=2yFWs-_2rcw

Sustained or tetanic contraction of myocardial contractile cells would be life-threatening and is prevented by special properties of their action potential, leading to a significantly longer refractory period and preventing re-excitation before muscle contraction is over. The resting potential of myocardial contractile cells is around -90 millivolts. It’s almost exclusively maintained by potassium ion efflux through delayed rectifier potassium channels. • Outline: • 00:00 - Introduction • 00:42 - Resting potenzial • 01:06 - Depolarization • 01:58 - Partial repolarization • 02:22 - Plateau phase • 02:52 - Final repolarization • 03:18 - Summary • Subscribe to AMBOSS YouTube for the latest clinical examination videos, medical student interviews, study tips and tricks, and live webinars! • Free 5-Day Trial: https://go.amboss.com/04g • Instagram: / amboss_med • Facebook: / amboss.med • Twitter: / ambossmed • #AMBOSSMed

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