Out in the open atmosphere, there is enough motion in the air to keep the oxygen and carbon dioxide mixed up. This motion of the air mostly comes from convection currents (i.e. wind) caused by temperature differences.
For homeostasis, insulin is the main hormone involved. Blood sugar regulation is the process by which the levels of blood sugar, primarily glucose, are maintained by the body.here are also several other causes for an increase in blood sugar levels. Among them are the 'stress' hormones such as epinephrine (also known as adrenaline), several of the steroids, infections, trauma, and of course, the ingestion of food.
Your hand will be at the approximate level of your pancreas. The pancreas produces the hormone insulin, to help lower the amount of glucose in the blood. This is the role of the 'endocrine pancreas'. The pancreas also produces the hormone glucagon which raises the amount of glucose in the blood.