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leeches
The liver is the second largest organ in the human body, and it is vital because it performs a number of essential functions related to digestion, metabolism, and the storage of nutrients. Without it, a human being would not be able to live, since the liver produces the chemicals necessary for digestion and it filters the blood coming from the digestive tract. The liver also detoxifies chemicals and metabolizes drugs. It also makes proteins important for blood clotting.
The primary function of the pancreas is to produce chemicals that are crucial to proper digestion and blood sugar regulation.
The endocrine system produces the hormones that control your body.
The beta cells in your pancreas.
medulla oblongata
The liver detoxifies the blood, synthesises protines, and produces biochemicals for digestion.
The Medulla controls the body functions such as breathing, digestion, blood flow and body temperature.
Arterial
It is the pancreas
the liver is part of many systems, it mostly deals with digestion but produces so many enzymes and chemicals it is involved in almost every system
I believe it is the Cell Membrane.