Define the terms:

1. Tissue
2. Organ
3. Organ system
4. Lymph
5. Neuron

1. A tissue is group of similar cells performing a specific function.
2. Several tissues together contributing to some specific function inside the body, constitute an organ.
3. Group of organs performing specific life function is called organ system.
4. Lymph is the fluid surrounding the body cells. It is essentially the blood plasma that has oozed out of the blood vessels. It contains white blood cells.
5. Neuron (nerve cells) are the fundamental units of the nervous system specialized to transmit information in the form of electrical impulses to different parts of the body.