ANATOMY

Detailed explanation-1: -Each hormone acts upon only those cells which have specific receptors. The cells which are acted upon by hormones are called target cells.

Detailed explanation-2: -Paracrine, autocrine and synaptic are three types of local hormone signaling. In paracrine signaling, hormones are released into the fluid between cells (the interstitial fluid) and diffuse to nearby target cells.

Detailed explanation-3: -So why do hormones affect only their target cells in particular tissues? Because only those target cells have receptors for that particular hormone. Some hormones bind to receptors on the surface of target cells. Others enter the cells and bind to receptors in the cytoplasm or nucleus.