Since the human body is made up of various substances, it stands to reason that one ought to know what these things are. The first substance in your body is water, and this makes up around 60% of your total weight. If you do not have enough water, you will be thirsty. Water regulates temperature by helping transport heat away from the skin when needed and into the blood stream where it can be released back to maintain a healthy internal temperature.
Water also helps regulate acidity levels in the stomach so that they don't become too high or too low which could lead to extreme diarrhea or constipation respectively.
The second substance in your body is salt. This substance helps to regulate the acidity levels of your stomach and also helps to maintain levels of electrolytes like potassium, sodium and calcium which are necessary for normal cardiovascular functioning.
The third major substance in the body is a carbohydrate called glycogen which helps to regulate energy levels within the body. This substance gets broken down when it needs to be used, and then reabsorbed once again for storage.
The fourth substance in your body is a fat called cholesterol. This helps to maintain cell walls and also helps to regulate the amount of oxygen that different cells receive.
The fifth substance in your body is protein, and this helps to keep cells together, including muscle cells. It also helps to regulate the fluid balance of different tissues within the human body.
The sixth substance in the human body is a chemical called creatine phosphate. This helps to regulate the supply of energy that comes from broken down sugars.
The body is a self-contained system of physical systems, chemical reactions and electrochemical signaling networks. The body's internal environment is tightly controlled by chemical levels that affect the electrical activity of neurons in various parts of the brain, which control impulses between nerve cells.
The body contains certain systems that maintain homeostasis and overall chemical levels, including the nervous system. The brain uses its own set of neurotransmitters to send signals throughout the body. These chemicals can be excitatory (causing nerve cells to fire) or inhibitory (inhibiting nerves from firing).
The chemical GABA (gamma-aminobutyric acid) is one of these inhibitory neurotransmitters, as is insulin. The body uses GABA to prevent nerves from firing in certain parts of the brain - which causes relaxation and drowsiness.
GABA also acts as a precursor to various other neurotransmitter chemicals, which the body can make from GABA. The role of these related chemicals is not fully understood.
Insulin is a hormone produced by the pancreas. Like GABA, insulin is also an inhibitory neurotransmitter and causes relaxation.
When insulin levels are high, the body is in a state of relaxation, and when insulin levels are low the body can be agitated. The role played by GABA and insulin acting as inhibitory neurotransmitters is to maintain overall chemical balance in the brain - preventing neurons from firing excessively.
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