PATHOLOGY

Detailed explanation-1: -Hormones can be thought of as chemical messages. From the blood stream, the hormones communicate with the body by heading towards their target cell to bring about a particular change or effect to that cell. The hormone can also create changes in the cells of surrounding tissues (paracrine effect).

Detailed explanation-2: -Hormones are the body’s chemical messengers. They carry information and instructions from one set of cells to another.

Detailed explanation-3: -The glands that make up the endocrine system produce chemical messengers called hormones that travel through the blood to other parts of the body.

Detailed explanation-4: -There are four categories of chemical signaling found in multicellular organisms: paracrine signaling, endocrine signaling, autocrine signaling, and direct signaling across gap junctions (Figure 44.1.

Detailed explanation-5: -All classes of hormones elicit the majority of their physiological effects via specific receptors which are located in three separate compartments of target cells: cell membranes (peptide and glycopeptide hormones), cytoplasm (steroid hormones) and nucleus (thyroid and steroid hormones).