Glycolysis, the first of the aerobic
respiration, is a in which
glucose degraded (broken) to
two pyruvic acid along with
the of two ATP two
NADH.

Glycolysis a complex reaction
the formation of
intermediate molecules until
acid molecules are . Although two
ATP are consumed in
reaction, there is production of four
of ATP, thus positive
balance of ATP molecules is
. Two NADH molecules also
produced. In the 6-carbon
structure glucose is broken two
organic chains three carbons each
made; these chains birth to two
acid molecules.