110 Coolster , gas & spark but no start. My GF's boy has a 2 yr old Coolster 110cc (Kazuma I believe but not 100%) Well it ran fine the other day...he rode it for an hour with a few breaks here and there.
Gas exchange is a biological process through which different gases are transferred in opposite directions across a specialized respiratory surface. Gases are constantly required by, and produced as a by-product of, cellular and metabolic reactions, so an efficient system for their exchange is extremely important. It is linked with respiration in animals, and both respiration and photosynthesis in plants.
The respiratory system in humans, like most mammals, is centered around a set of lungs used for gas exchange. In humans, the lungs are connected to the oral and nasal cavities via the trachea to allow for transfer of oxygen to and carbon dioxide from the bronchial tree (figure 1.2) of the lungs.