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what are harmons?

Hormone is a chemical substance secreted by a single cell or a collection of cells called gland. Hormones flow from gland to  to another part of the body through blood to stimulate various types of metabolism. It acts as a messenger that transport signals from one cell to another. There are several hormones produced in our body including thyroxine, estrogen, progesterone, testosterone etc. Plant hormones like auxin, gibberelin, ethylene etc are called phytohormones.

 

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A hormone is a substance, usually a peptide or steroid, produced by one tissue and conveyed by the bloodstream to another to effect physiological activity, such as growth or metabolism. Hormones are chemicals that are used for messaging in multicellular organisms. Every multicellular organism produces hormones. The cells that react to a given hormone have special receptors for that hormone. When a hormone attaches to the receptor protein a mechanism for signalling is activated. The messages can be sent to nearby cells or to far-away cells. If a cell wants to send a message to a nearby cell, it puts the hormone into the tissue around it.
 
 
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A Hormone Is A Chemical Substance That Is Released By Endocrine,Exocrine Or Heterocrine Glands To There Target Site Or The Place Where They Should Act.Endocrine Glands Pour Them Directly In The Blood Stream Through Ducts.They Are Released To Stimulate There Respective Target Sites.

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hormones is a chemical released by cell or a gland in one part of the body that sends out messages that effect cell in other parts of the organism.

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the changes which are occoured at puberty are  controll by harmones,these  are chemical secreations.


 

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