0
Steroid hormones act in the transcriptional level in the nucleus of a cell, due to their ability to travel through cell membranes (hydrophillic). Second messengers are necessary for hormones that cannot penetrate cell membranes (peptides).
Wiki User
∙ 14y ago
Add your answer:
Earn +20 pts
Why do protein hormones need second messenger to activate target cell?
Protein hormones that need second messenger to activate a target cell are hydrophobic. They therefore need these second messengers in order to penetrate into the cell membrane. steroid hormones are hydrophilic so they do not need second messengers.
The second-messenger mechanism of hormone action operates by?
Binding to specific receptors and employing the services of G proteins and cAMP.
When a small amount of one hormone allows a second hormone to have its full effect the phenomenon is called?
When a small amount of one hormone allows a second hormone to have its full effect the phenomenon is called
Explain the mechanism of action of nonsteroid hormones?
All non steroid hormones are proteinacious and can't enter cell .they attach with fixed membrane receptor which activates an enzymes that activates a second messenger i.e. cAMP that carries message in side cell .
Steroid hormones exert their action by?
steroid hormones can pass easily through the plasma membrane, the hormones then bind to intracellular receptors which induce a metabolic pathway which later promotes transcription of a specific gene.
True or false steroid hormones perform accoding to the second messenger mechanism?
steroid hormones are hydrophobic and bind to transport proteins which bind to receptors within the nucleus. hydrophillic hormones bind to plasma membrane receptors and act through second messenger systems
When a catecholamine or peptide hormone binds to receptors on the surface?
A second messenger appears in the cytoplasm...
A neurotransmitter whose function depends on a second messenger is known as?
A neurotransmitter whose function depends on a second messenger is known as a norepinephrine. It is a hormone that is released by the sympathetic nerves and the adrenal medulla.
Why do protein hormones need second messenger to activate target cell?
Protein hormones that need second messenger to activate a target cell are hydrophobic. They therefore need these second messengers in order to penetrate into the cell membrane. steroid hormones are hydrophilic so they do not need second messengers.
What is the difference between receptors for steroid hormones and Peptide hormone?
Peptide based hormones exert their effects on a cell by way of second messengers (cAMP or PIP) pathways. Steroid based hormones exert their effects on a target cell via direct gene activation.
How do non steroid hormones control their target cells?
They: Bind to cell membrane receptors Use cAMP as a second messenger and they cause a cascade amplification reaction
Which one of these hormones does not act on a second messenger system is it Glycogen Epinephrine growth hormone or testosterone or acth which one?
testosterone
How do water soluble hormone like calcitonin or epinephrine affects a cell through a second-messenger system?
It binds to the receptors outside the cells
Which class of molecules functions are chemical signals?
peptides(poly),gases,neurotransmitters,neuropeptides,steroid hormones ...etc.
Which type of hormone requires a second messenger?
Virtually all of the protein or amino acid-based hormones exert their effects through intracellular second messengers KT
What are the two ways hormones affect target cells?
Dopamine and norepinephrine Balances the chemicals in the brain to produce abnormality goes through the blood barrier, and norepinephrine is responsible to help the body decide and respond from fault, fear and danger.
What are two ways in which the chemical message of a hormone is converted into a cell response inside the cell?
The chemical message is converted via the second messenger system
