1. Bloodstream: Glucose is the primary energy source for most cells in the body. It's constantly circulating in the bloodstream, ready to be absorbed by cells.
2. Cells: Inside cells, glucose is broken down in a process called cellular respiration to generate energy (ATP). This occurs in both plant and animal cells.
3. Liver: The liver stores excess glucose as glycogen, a complex carbohydrate, for later release when needed.
4. Muscles: Muscles also store glycogen as an energy reserve, particularly for intense physical activity.
5. Plants: Plants produce glucose through photosynthesis, using sunlight, water, and carbon dioxide. They use this glucose for growth, development, and energy.
6. Other Tissues: While less concentrated, glucose is found in other tissues like the brain, nervous system, and kidneys.
Note: While glucose is essential for life, its concentration varies depending on the organism and its specific needs. For example, animals have higher glucose levels in their blood than plants.
