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what is hormone? why is it needed? what is its function explain

Hormones are our body's chemical messengers.. They travel in our bloodstream to target tissues or organs. They work slowly, over time, and affect many different processes, for

    Growth and development
    Metabolism -
    Sexual function
    Reproduction
    Mood

Endocrine glands, which are special groups of cells, make hormones. The major endocrine glands are the pituitary, pineal, thymus, thyroid, adrenal glands and pancreas.
Hormones in animals are often transported in the blood. Cells respond to a hormone when they express a specific receptor for that hormone. The hormone binds to the receptor protein, resulting in the activation of a signal transduction mechanism that ultimately leads to cell type-specific responses.

Endocrine hormone molecules are secreted (released) directly into the bloodstream, while exocrine hormones (or ectohormones) are secreted directly into a duct, and from the duct they either flow into the bloodstream or they flow from cell to cell by diffusion in a process known as paracrine signalling.
Hormones are informational molecules. They are secreted in response to changes in the environment inside or outside the body. for example:
Calcitonin secreted by thyroid gland regulates the concentration of calcium and phosphorus in the blood. When the concentration of calcium rises in the blood, the secretion of calcitonin is seen which lowers the concentration of calcium and phosphorus in the plasma by decreasing the release for the bones.


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