The water surface area determines how much oxygen diffuses and dissolves into the water. It penetrates the skin upon contact and it diffuses straight to the bone. Hence, it diffuses across membranes through facilitated diffusion, down the concentration gradient. Oxygen passively diffuses in the lung alveoli according to a pressure gradient. The carbonic anhydrase produces CO from the bicarbonate that diffuses into the carboxysome. During that time untreated water diffuses across the membrane and dilutes the sports drink syrup. Glucose diffuses rather rapidly from the dialysate to the blood (capillaries). This small benzoquinone molecule is very hydrophobic, so it diffuses freely within the membrane. Also, water vapor diffuses through the stomata into the atmosphere in a process called transpiration. It then diffuses onto the catalyst surface. The powder layer diffuses the light from the filament. Acetylcholine then diffuses across the synaptic cleft. Amoxicillin diffuses easily into tissues and body fluids. This produces an image that diffuses light. Jellyfish do not need a respiratory system because sufficient oxygen diffuses through the epidermis.