After sucrose is digested into glucose and fructose in the small intestine:
- Absorption into blood: Glucose is absorbed through the villi of the small intestine into the bloodstream.
- Transport to cells: Blood carries glucose to all body cells.
- Entry into cells: Glucose enters cells through the cell membrane using specific transport proteins (glucose transporters).
- Reaches the cytoplasm: Once it crosses the cell membrane, glucose is present in the cytoplasm (cytosol) of the cell.
- Glycolysis begins: In the cytoplasm, glucose is broken down to pyruvate during glycolysis.
Flow Chart
Sucrose → Glucose + Fructose (small intestine) → Blood → Body cells → Cytoplasm → Glycolysis → Pyruvate
For NEET, remember:
- Digestion of sucrose: Small intestine
- Absorption of glucose: Intestinal villi
- Site of glycolysis: Cytoplasm
- Site of aerobic respiration after glycolysis: Mitochondria