The Video lecture from Bioenergetics (F.Sc. First Year Biology) covers the fourth phase of cellular respiration; Respiratory chain also known as Electron transport chain. It involves a series of oxidation and reduction reactions occurring in the inner membrane of mitochondria which ultimately yield ATP. It also includes the concept of oxidative phosphorylation and chemiosmosis. Find more e-learning material and educational video lectures in Urdu at maktab.pk. These videos are free to use for promotional and commercial purpose by keeping the credits to Maktab.