what are free radicals and how are they formed with aerobic cellular respiration?
The unstable form of oxygen is known as free radical. It is a type of reactive oxygen species (ROS) which contains an oxygen atom with an unpaired electron in its outermost shell.
These free radicals are formed via aerobic cellular respiration driven by electron transport chain (ETC) in mitochondria.
Now keeping it short...
ETC is involved in the formation of ATP. But to start this process, the initiator is NADH. On the availability of NADH, it moves from cytosol to the mitochondria, where it denotes an electron to the ETC which proceeds down the line and in the presence of oxygen forms ATP. On the opposite side, some electrons escape going to ETC , and instead combine with oxygen to form superoxide radicals (O2•-), which is a type of free radical.
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