How do cells obtain energy?

Beginning with energy sources obtained from their environment in the form of sunlight and organic food molecules, eukaryotic cells make energy-rich molecules like ATP and NADH via energy pathways including photosynthesis, glycolysis, the citric acid cycle, and oxidative phosphorylation.

Cells have an organelle known as 'mitochondria' which has ATP molecules in it. These ATP molecules generates energy for the cell to function properly.

Cells need a source of energy, they get this energy by breaking down food molecules to release, the stored chemical energy.

This process is called 'cellular respiration'.

The process is happens in all the cells in our body.

Oxygen is used to oxidize food, main oxidized food is sugar(glucose).

this is math not biology xd

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.