The immune system is the body’s natural defense system, consisting of a series of complex which consists of cells, tissues, and organs are fused with each other to keep foreign substances such as bacteria, viruses, parasites and fungi that enter the body. Immune system will produce leukocytes, various chemicals, and other proteins that will attack and destroy foreign substances before they could reproduce.

If this method fails, the immune system will produce more and more substance the attacker to destroy foreign substances that have been reproducing. Immune system may be related to a variety of different foreign substances. Immune system can attack the necessary substances to attack almost any kind of foreign substance. Immune system continues to work throughout the year because they have to continually provide defense against all sorts of foreign substances from the inside and outside the body.

Intensive work routines sometimes make people less rest. One of the less rest effects is the decrease in endurance. So, take some time to rest in bed. Select sport according to the capability of the body such as gymnastics, running, tennis, soccer. With regular exercise, be fit and physical endurance to be good.

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