Respuesta :
Tyrosine is the precursor for the synthesis of epinephrine .
Hence the correct answer is option A .
What is tyrosine?
Tyrosine is a non essential amino acid that is made by the human body from another amino acid called phenylalanine. The main function of this is the production of various neurotransmitters like epinephrine , non epinephrine , dopamine , etc,.
How is epinephrine formed ?
Tyrosine is sequentially converted to dihydroxyphenylalanine (DOPA) and then into dopamine. Further ,this dopamine is converted into nor- epinephrine and eventually , epinephrine is formed.
- Steroidal hormones are synthesized using ' cholesterol ' , mainly in the cortical region of adrenal gland.
- Parathyroid hormone is secreted by 'cheif cells' in the parathyroid gland.
- Acetylcholine is synthesized from 'acetyl coenzyme A' , which is a two - carbon compound.
Thus from the above, we can conclude that the amino acid tyrosine is the starting substrate for the synthesis of epinephrine .
So the correct answer is option A .
To learn more about epinephrine :
https://brainly.com/question/22817529
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