NAD is a coenzyme.
Its role is as a hydrogen acceptor when it is involved in the oxidation of glucose (cell respiration). Is is written as NAD+, and after accepting hydrogen it becomes the reduced form, NADH.
NADH in turn acts as a hydrogen donor when it becomes oxidized to reform NAD+.
O2 ADDED: Not O2, but one atom of oxygen.
In aerobic respiration, the final electron acceptor is (usually) oxygen. Sometimes it can be sulfur or nitrogen in the absence of oxygen (as in extreme environments) in extremophiles.
For animals, the final hydrogen acceptr in cellular respiration is
Molecular Oxygen, otherwise known as O2.
oxygen
Aerobic respiration requires oxygen to operate (whereas anaerobic respiration does not), and oxygen is the electron acceptor.
O2 ADDED: Not O2, but one atom of oxygen.
In aerobic respiration it is oxygen.
Oxygen in aerobic respiration.
oxygen
Oxygen is required to live without it we die
Because oxygen is the last electron acceptor
It is the last electron acceptor
oxygen
In aerobic respiration, the final electron acceptor is (usually) oxygen. Sometimes it can be sulfur or nitrogen in the absence of oxygen (as in extreme environments) in extremophiles.
For animals, the final hydrogen acceptr in cellular respiration is
oxygen