Production of oxygen during photosynthesis is the byproduct of the breakdown of water. is a direct result of the electron transport chain. occurs during the light-independent reactions. is the primary goal of photosynthesis.

The process that produces oxygen is the photosynthesis and when oxygen is released as the result of its production during photosynthesis, it is a by-product of splitting the water molecules. The reduction of oxygen which forms water occurs during respiration.

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.