What is a feocromocitoma? Feocromocitomas are tumors of chromaffin cells of the adrenal medulla that produce, store, metabolize, and secrete catec...
What is a feocromocitoma?
Feocromocitomas are tumors of chromaffin cells of the adrenal medulla that produce, store, metabolize, and secrete catecholamines.
The normal adrenal produces much more epinephrine than norepinephrine.
Feocromocitomas can produce both catecholamines, but usually produce more norepinephrine, which acts on alpha-1 and beta-1 adrenergic receptors with greater affinity than on alpha-2 and beta-2 adrenergic receptors.
a) Only statement I is correct.
b) Statements I and II are correct.
c) Statements I and III are correct.
d) All statements are correct.
Feocromocitomas are tumors of chromaffin cells of the adrenal medulla that produce, store, metabolize, and secrete catecholamines.
The normal adrenal produces much more epinephrine than norepinephrine.
Feocromocitomas can produce both catecholamines, but usually produce more norepinephrine, which acts on alpha-1 and beta-1 adrenergic receptors with greater affinity than on alpha-2 and beta-2 adrenergic receptors.
a) Only statement I is correct.
b) Statements I and II are correct.
c) Statements I and III are correct.
d) All statements are correct.
💡 1 Resposta
Ed 
A resposta correta é a alternativa "c) As afirmações I e III estão corretas". O feocromocitoma é um tumor das células cromafins da medula adrenal que produzem, armazenam, metabolizam e secretam catecolaminas. A adrenal normal produz muito mais epinefrina do que norepinefrina. O feocromocitoma pode produzir ambas as catecolaminas, mas geralmente produz mais norepinefrina, que age nos receptores adrenérgicos alfa-1 e beta-1 com maior afinidade do que nos receptores adrenérgicos alfa-2 e beta-2. Portanto, as afirmações I e III estão corretas.
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