I am posting below, word for word, two statements made on Relative Refractory period - the first from the text: Human Physiology for Medical Students by Magdi Sabry, and the second from a web page with the URL: https://content.byui.edu/file/a236934c-3c60-4fe9-90aa-d343b3e3a640/1/module5/readings/refractory_periods.html.
In addition, I've attached a photo from Google which appears to be in support of the second statement. But which of these is correct?
- "Relative refractory period (RRP)...corresponds to the remaining part of the descending limb of the AP till the start of after-depolarization (i.e. during the later 2/3 of RP)"
2."...there are two types of refractory periods; the absolute refractory period, which corresponds to depolarization and repolarization, and the relative refractory period, which corresponds to hyperpolarization. "