Since biochemical function is determined largely by specific enzymes (proteins), different sets of genes must be turned on and off in the various cell types. This is how cells differentiate.
The statement that is not true regarding the immune system and homeostasis: 'The immune system is an independent system which does not interact with other organ systems'.
The immune system includes organ systems as well as processes of the body that enables an individual to resist and combat infections and toxins produced by various pathogens. The immune system encompasses organs such as the thymus gland, bone marrow as well as lymph nodes.
The white blood cells or lymphocytes are responsible for fighting infections in the body and lymph or lymphatic fluid carries these cells in the body from one place to another. Lymph nodes act as a filter for the lymphatic fluid.
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