Absolute and Relative Refractory period in cardiac muscle | Cardiovascular Physiology mbbs 1st year
Channel: Physiology Open
Date: 14/02/2020

Physiology lecture  on cardiovascular system physiology explains Absolute and relative refractory period.
Cause of Absolute refractory period
From phase 0 to half of phase 3 of cardiac action potential is absolute refractory period. It occurs because sodium channels are in inactivated state during this time.

Cause of relative refractory period
After half of phase 3 to RMP is relative refractory period. It occurs because some channels have chanaged their state to closed state so few channels are available which can open.

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