# What are the reactants and end products of cellular respiration?

Apr 18, 2018

Glucose and oxygen are the reactants and the end products are carbon dioxide and water with the liberation of energy in form of ATP.

#### Explanation:

Cellular respiration occurs in living cells. It provides energy to the cell for carrying out its metabolic activities.

Glucose ( $C 6 H 12 O 6$) is the substrate. It is broken down into $C O 2$ and $H 2 O$ in presence of $O 2$, with the liberation of energy in form of ATP molecules.

Cellular respiration occurs in 2 steps:
Glycolysis and Kreb's cycle or Citric acid cycle .

Glucolysis occurs in absence of oxygen . Glucose is converted into fructose 1;6 di-phosphate that is converted into 2 molecules of pyruvic acid in a series of steps of glycolysis.

Pyruvic acid is converted into oxalacetate that enters Kreb's cycle . Kreb's cycle occurs in presence of oxygen. During Kreb's cycle, $C O 2$ and $N A D P H 2$ are produced. $N A D P H 2$ is oxidised into $N A D P$ in presence of $O 2$ to generate ATP molecules. This process is termed oxidative phosphorylation .