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Receptors are defined as specialized structures found in the cell membrane.

Receptors are defined as specialized structures found in the cell membrane. They are mainly composed of proteins, which bind to ligands and cause responses to the immune system. These receptors are found in various immune cells, including the B cells, T cells, stem cells and in monocytes. Apart from the immune cells, receptors are present in other parts of the human body. The sense organs, including the eyes, ear, nose, tongue and skin are examples of receptors. Explore more :  Immune system

Receptors, the protein molecules in the target cell or on its surface are involved in various functions including:

Read more:  Metabolisms and Its Process Let’s learn more about the types of receptors

Based on their location, receptors are broadly classified into two types:

Internal receptors include: Growth Factor Receptors The growth factor receptors play an important role in the regulation of cell development, division and differentiation. The receptors include:

Cytokine Receptors The cytokine receptors are involved in permitting cells to communicate with the extracellular environment by responding to signals generated by other parts of the organism. It is also involved in gene expression, the release of mediators, changes in the cell cycle, etc. Refer more:   Cell Cycle and Cell Division Cell-surface receptors include: B Cell Receptors These cells are also called the B cells or B lymphocyte. They are developed in the bone marrow and circulate in the blood and lymph. The main functions of a B cell are to produce antibodies against the foreign molecules or pathogens that enter the body. These cells play a vital role in adaptive immunity and the initiation of allergic responses. T Cell Receptors The T cell is the type of lymphocyte, which is developed in the thymus gland. They are responsible for removing the pathogens from the body. Granulocyte Receptor This is a type of immune cell that comprises granules and is involved in releasing enzymes during allergies, infections and  asthma . There are three different types of granulocytes receptors – The cells of white blood cells -Basophils, Eosinophils and Neutrophils. Read more:  Types of White Blood Cells

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