Renal (Kidney) Function and Hormonal Regulation (copy)

Microalbumin Tests

Tests that measure small amounts of albumin in the urine, serving as an early indicator of glomerular damage.

ADH (Antidiuretic Hormone) Function

Hormone that promotes water reabsorption in the kidneys and causes vasoconstriction.

Renal Tubules Function

Reabsorb essential substances like water and electrolytes, while secreting waste products.

Glomerulus Purpose

Filters blood to create filtrate, allowing water, ions, and small molecules to pass.

Glomerular Filtration Rate (GFR)

A lab test measuring how well the kidneys filter waste from the blood, indicative of kidney function.

Creatinine Clearance

A measure of how efficiently the kidneys filter creatinine, a waste product of muscle metabolism.

Renin

An enzyme that converts angiotensinogen to angiotensin I, playing a key role in regulating blood pressure.

Angiotensinogen II

A potent vasoconstrictor that raises blood pressure and stimulates aldosterone release.

Aldosterone

A hormone that promotes sodium reabsorption in the kidneys, leading to increased water retention.

Normal Glomerular Filtration Rate

Ranges from 90 to 120 mL/min, indicating efficient kidney function.

Normal Serum BUN to Creatinine Ratio

Typically between 10:1 and 20:1; a ratio of <10:1 may indicate kidney dysfunction.

Osmolality Tests

Tests that measure the kidneys' ability to concentrate urine; higher osmolality indicates better concentrating ability.

Bicarbonate Ions

Ions absorbed and secreted by the kidneys to help regulate body pH.

ADH and Hydration Relationship

ADH decreases with increased hydration, leading to increased urine output, and increases with decreased hydration, leading to decreased urine output.

Impact of RAAS on Blood Pressure

RAAS increases blood pressure through fluid retention and vasoconstriction, regulated by renin, angiotensin II, and aldosterone.