The diagram above explains the fact that the lymphatic system is part of the circulatory system and plays three major roles which may include the removal of excess fluids including red blood cells from the body, absorption of fatty acids as well as helping to transfer fatty substances and chyle to the circulatory system. And, it helps in the production of lymphocytes, monocytes, and antibody producing cells which help to strengthen our immune system against any invaders that make us sick. Like the cardiovascular system, the lymphatic system is made up of vessels. Although, it lacks a heart that pumps blood such as what is obtainable in the cardiovascular system, the lymphatic system has got lymph which is produced as blood plasma that is discharged from the capillaries of the circulatory system via skeletal muscle contraction. The lymphatic system has also got valves and lymph nodes to prevent backflow.
Information contained in my class notes point to the fact that lymph nodes can only be found at
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Insulin signals the liver, the muscle and the fat cells to increase their anabolic activities by absorbing glucose from the blood. Insulin is released when either glucose is present in our body or protein is ingested in our system. Body cells are able to absorb glucose from the blood because of the presence of insulin. Without insulin, it will be impossible for glucose to enter our cells and without glucose in our cells, they will not be able to function properly. Thus, insulin regulates how the body stores and uses glucose and fat inside the body system. Glucose is stored in the liver and muscles as glycogen and in so doing, the body will stop using fat as a source of energy. The body will only resort to using fat as a source of energy when there is a shortage of insulin in our body system