In the absence of Hg2+, MerR functions as a repressor and binds to the operator region of the mer operon, thus preventing transcription of the structural genes.

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#Id: 5826

#Unit 7. System Physiology – Animal

Addison disease (primary adrenocortical insufficiency) caused by autoimmune destruction of all zones of the adrenal cortex.

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#Id: 5827

#Unit 7. System Physiology – Animal

Cushing syndrome Chronic excess of glucocorticoids (hypersecretion of ACTH from a pituitary adenoma)

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#Id: 5828

#Unit 7. System Physiology – Animal

Conn syndrome (primary hyperaldosteronism) caused by an aldosterone-secreting tumor.

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#Id: 6505

#Unit 7. System Physiology – Animal

Principal catecholamines synthesized by the adrenal medulla:

Norepinephrine

Epinephrine

Dopamine

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#Id: 6506

#Unit 7. System Physiology – Animal

Norepinephrine is formed by hydroxylation and decarboxylation of tyrosine

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#Id: 6507

#Unit 7. System Physiology – Animal

Some of the tyrosine is formed from phenylalanine, by Phenylalanine hydroxylase