Question

Explain two pathways of breakdown of glucose molecule in respiration process of human being

Answer 1

Dear student,
The process of breakdown of glucose molecules involves two major stages - glycolysis (anaerobic respiration) and aerobic respiration ( Kreb's cycle and ETS Pathway). Cellular respiration begins at this stage in the cytoplasm of the cells, and yields 2 carbon-based molecules called pyruvate, and 2 molecules of ATP.

In presence of oxygen :
- Breaking down of glucose into pyruvate takes place in Mitochondria of a cell.
- End products are COâ‚‚ , Hâ‚‚O and energy.

⑵ In insufficient presence of oxygen :
- In muscle cells, due to insufficient presence of oxygen the cells undergoes anaerobic respiration.
- End products are Lactic acid and lot amount of energy.

⑶ In absence of Oxygen :
- In absence of Oxygen, glucose breakdown into pyruvate in cytoplasm only.
- End product are Ethanol, and small amount of energy.

With regards!