Mechanism of Action of Steroid Hormones
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Mechanism of Action of Steroid Hormones

Learn about the mechanism of action of steroid hormones, including their ability to pass through cell membranes, form hormone-receptor complexes, and influence gene transcription. Understand how steroid hormones interact with DNA to produce specific mRNA.

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@CostSavingAstrophysics

Questions and Answers

What is the location of the receptors for steroid hormones?

Cytoplasm

How do steroid hormones initiate protein synthesis?

Forming hormone-receptor complexes that bind to mRNA

Which type of hormones combine with their specific receptors inside the nucleus?

Thyroid hormones

Which system involves the formation of hormone-receptor complexes that move to the nucleus?

<p>Steroid hormones mechanism of action</p> Signup and view all the answers

What is the role of thyroid hormones when they bind to DNA in the nucleus?

<p>Increase or decrease enzyme synthesis</p> Signup and view all the answers

How may hormone secretion be influenced by factors such as epinephrine?

<p>Stimulated</p> Signup and view all the answers

What is the role of the cAMP system in the mechanism of action of protein and polypeptide hormones?

<p>cAMP diffuses through the cell and affects the transport system or enzyme activity.</p> Signup and view all the answers

What is the role of the calcium-calmodulin system in the mechanism of action of protein and polypeptide hormones?

<p>Calcium-calmodulin complex increases or decreases various enzyme activities inside the cell.</p> Signup and view all the answers

What is the role of the membrane phospholipids system in the mechanism of action of protein and polypeptide hormones?

<p>Membrane phospholipids are broken down into diacylglycerol (DAG) and inositol triphosphate (IP3), which act as second messengers.</p> Signup and view all the answers

How do steroid hormones differ in their mechanism of action compared to protein and polypeptide hormones?

<p>Steroid hormones directly activate or inactivate enzymes, while protein and polypeptide hormones use second messengers to affect enzyme activity.</p> Signup and view all the answers

Which of the following is a key difference between the mechanism of action of steroid hormones and protein/polypeptide hormones?

<p>Steroid hormones directly affect enzyme activity, while protein/polypeptide hormones use second messengers.</p> Signup and view all the answers

Which of the following is a common feature of the second messenger systems used by protein and polypeptide hormones?

<p>They all involve the generation of small molecules that can diffuse within the cell and regulate various cellular processes.</p> Signup and view all the answers

What is the end result of a hormone's action on its target cells?

<p>Change in the rate of performing specific activities</p> Signup and view all the answers

Which type of hormones are derived from cholesterol?

<p>Steroid hormones</p> Signup and view all the answers

Which system involves the activation of cAMP as a second messenger?

<p>cAMP system</p> Signup and view all the answers

What is the main function of steroid hormones in the body?

<p>Directly entering target cells to affect gene expression</p> Signup and view all the answers

Which type of hormones act by binding to intracellular receptors and directly influencing gene expression?

<p>Steroid hormones</p> Signup and view all the answers

In which mechanism of action do hormones utilize calcium-calmodulin complex to exert their effects?

<p>Calcium-calmodulin system</p> Signup and view all the answers

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