3.4 HOMEOSTASIS IN HUMANS

HOMEOSTASIS

The maintenance of relatively constant internal

environment

KIDNEYS

Regulate the water & salt balance in the body by

•excreting more/less salt•Increasing the intake

/loss of water

Regulate osmotic pressure & ionic levels in

the blood

Excrete waste products

Regulate the blood pH

RENAL ARTERY : Supplies oxygenated blood & nutrients

to the kidney

RENAL VEIN : carries filtered blood away from kidney

NEP

HR

ON

S

Glomerulus Bowman’s Capsule Renal tubule

FORMATION OF URINE

ULTRAFILTRATION REABSORPTION SECRETION

WaterGlucose

Amino acidsUrea

Mineral SaltsRBC

Plasma proteins

Ultrafiltration

OSMOREGULATION

REVISION