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NUTRIENT ABSORPTION AND STORAGE
The ultimate goal of the digestive process is to deliver nutrients and energy into the bloodstream so that your cells can soak them up to propel your mountain adventures. If all goes well, nutrients move on to the lymph system and then travel to the liver. They enter the liver via the hepatic portal vein for a quick scan to sort out which nutrients need further processing and which can be passed along to general circulation. Dietary fats (both saturated and unsaturated) are the exception, and they take a different route. The short-and medium-chain fatty acids are absorbed by the lymphatic system before going into the bloodstream and the liver for further processing.
The liver.
The liver filters toxins and drugs before returning the blood to the rest of the body. Once glucose, amino acids, and fatty acids have passed through the liver, they can be used by muscle cells, fat cells, and the brain. In the muscles, glucose is used in ATP production or stored as glycogen; amino acids are used to synthesize new proteins; and fatty acids are used to provide energy, stored as triglycerides, or used for structures such as plasma membranes.