Alkalosis
The process of exchanging gases with the bloodstream is called respiration. In the lungs, oxygen from the air we breathe diffuses into the bloodstream while carbon dioxide from the bloodstream diffuses into the air in our lungs to be exhaled.
The gland that releases its secretion into the bloodstream is called an endocrine gland. These glands produce hormones that are released directly into the bloodstream to regulate various body functions.
Endocrine glands secrete chemicals called HORMONES into the bloodstream
The network of vessels that returns fluid to the bloodstream is called the Lymphatic System.
Acidosis
The gas that passes from the bloodstream into the lungs is called carbon dioxide. Carbon dioxide is transported from the tissues to the lungs via the bloodstream, where it is exhaled out of the body during respiration.
Glucose is absorbed into the bloodstream through a process called facilitated diffusion in the small intestine. Specialized proteins called glucose transporters help move glucose molecules from the intestine into the bloodstream, where it can be used for energy by the body's cells.
A flea would somehow have to enter the bloodstream to get to the heart. This occurring is highly unlikely if not impossible.
Macrophage
Statins
hydrochloric acid
+++Osmosis