what do you mean by hormone and write their characteristics
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Hormones
All multicellular organisms produce hormones. Plant hormones are known as phytohormones. Blood is the medium of transport of animal hormones. The term hormones is derived from Greek word homao which means to excite. It was first used by William M. Bayliss and Ernest H. Starling, both of the London University College, in the year 1904. They showed a chemical substance - secretin, secreted in the intestine can stimulate the action of a pancreatic secretion. These substances were known as 'chemical messengers'.
The tissues that produce the hormones are known as the effectors while those tissues are that are influenced by the effectors are called as targets. Hormones are of low molecular weight and they diffuse readily. The effects brought about by the hormones are not permanent as the get readily oxidized.
All multicellular organisms produce hormones. Plant hormones are known as phytohormones. Blood is the medium of transport of animal hormones. The term hormones is derived from Greek word homao which means to excite. It was first used by William M. Bayliss and Ernest H. Starling, both of the London University College, in the year 1904. They showed a chemical substance - secretin, secreted in the intestine can stimulate the action of a pancreatic secretion. These substances were known as 'chemical messengers'.
The tissues that produce the hormones are known as the effectors while those tissues are that are influenced by the effectors are called as targets. Hormones are of low molecular weight and they diffuse readily. The effects brought about by the hormones are not permanent as the get readily oxidized.
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Hormones are the chemical substances which coordinate the activities of living organisms and also their growth.Four characteristics of hormones in humans are:
1) Hormones are secreated in small amountsby endocrine glands
2) The hormones are poured directly into blood and carried throughout the body
3) The hormones have their effect at the sight different from the sight at which they are made.
4) The hormones act only on target organs
1) Hormones are secreated in small amountsby endocrine glands
2) The hormones are poured directly into blood and carried throughout the body
3) The hormones have their effect at the sight different from the sight at which they are made.
4) The hormones act only on target organs
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