Adrenal Function, Testing and Disorders Chemistry CLS 415 Didactics Ricki Otten, MT(ASCP)SC Part 2: Cortex Hormone Function and Regulation.

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Adrenal Function, Testing and Disorders Chemistry CLS 415 Didactics Ricki Otten, MT(ASCP)SC Part 2: Cortex Hormone Function and Regulation

Mineralcorticoids: Aldosterone Function/Physiologic effects Na + and K + homeostasis Regulates extracellular fluid volume through sodium reabsorption by kidneys Synthesized only in the adrenal gland: zona glomerulosa Major control mechanism: Renin-angiotensin-aldosterone (RAA) system 2

Renin: an enzyme Produced in the juxtaglomerulosa cells of the kidney 3

Angiotensin converting enzyme (ACE) Produced in lung Angiotensinogen: a protein substrate Produced in liver 4

Angiotensin II: Potent vasoconstrictor Stimulates Adrenal Cortex to produce Aldosterone 5

6 2 1

7 2 1

8 2 1

9 2 1

Glucocorticoids: Cortisol Essential for life Major stress protector 10

Glucocorticoids: Cortisol Function/Physiologic effects Influences carbohydrate metabolism: Promotes gluconeogenesis Promotes glycogenolysis Stimulates protein catabolism (breakdown) Central distribution of fat: neck, face and trunk Anti-inflammatory actions Immunosuppressive actions Anti-allergic properties Increase plasma glucose 11

Glucocorticoids: Cortisol Diurnal variation Under ACTH influence Highest cortisol levels in early am Lowest cortisol levels in late pm Synthesized in the adrenal gland Major control mechanism: Negative feedback control 12

Hypothalamus-Pituitary-Adrenal axis 13

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