Question

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★ Give the mechanism of Hormone Action..★

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Answer 1

Heya...

here is ur answer...

Mechanism of Hormone Action. ... Each hormone has receptors that are found on the cell membrane of the target organ. Once the hormone bind to its designated receptor, a series ofactions are initiated to release secondary messengers inside the cell....

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Answer 2

Mechanism of Hormone Action

Before we understand the mechanism of hormone action, let’s look at what are hormone receptors. Each hormone has receptors that are found on the cell membrane of the target organ. Once the hormone bind to its designated receptor, a series of actions are initiated to release secondary messengers inside the cell. These secondary messengers are responsible for relaying information to the nucleus or other organelles. Based on their structure, receptors are of different types:

Internal receptors–

• They can be either nuclear or cytoplasmic. Nuclear receptors are found on the nuclear membrane while the cytoplasmic receptors are found in the cytoplasm of the cell. These receptors are for the steroid hormones.

External receptors–

• These are the transmembrane receptors which are embedded in the lipid layer of the cell membrane. These receptors are for the protein ones.

• The mechanism of action hormone can be of two types: First, where the receptors are fixed and the second, where the receptors are mobile.

Fixed Receptor MECHANISM

• This mechanism of action hormone is seen in the protein hormones such as Adrenaline, insulin, ADH, TSH etc. As mentioned earlier, since they are water soluble, they cannot pass through the cell membrane as it is made up of a lipid layer. So, they bind to their extracellular receptors present on the membrane.

• Once the protein hormone binds to the receptor, a series of reactions occur beginning with the production of adenyl cyclase enzyme. This enzyme leads to the production of cyclic AMP which is the secondary messenger. This cyclic AMP can now enter the cell and cause the effect it was meant to bring about.

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