Arterial

blood

supply to

the left

kidney!

a. Excrete (get rid of) metabolic wastes in

the blood by filtering them out and

excreting them in urine.

b. Maintain homeostasis of…a. Amount of H20

b. Amount of salts

c. Amount of Na+/K+

d. pH of body fluids

Renal cortex: contains nephrons

functional unit of kidney (1 million per

kidney!)

Medulla: composed of renal pyramids

Renal pyramids: contain collecting ducts

Calyx: drain urine from each renal

pyramid and into ureter

a. Filtration: Filtration occurs in the glomerulus. Blood pressure forces water, salt, glucose, amino acids, and urea into the glomerular capsule. Proteins and blood cells are too big to cross the membrane; they remain in the blood. The fluid that enters the renal tubules is called the filtrate.

a. 15 gallons

b. 25 gallons

c. 45 gallons

d. 125 gallons

125 milliliters of blood per minute

45 gallons of blood in 24 hours!!!

b. Reabsorption: As the

filtrate flows through the

renal tubule, most of the

water and nutrients are

reabsorbed into the blood.

The concentrated fluid that

enters the collecting duct

is called urine.

c. Secretion: Some

substances that were

reabsorbed are secreted

into the filtrate, such as

certain drugs, excess

potassium, or as a final

way to control blood pH.

Know the pathway of urine from the

kidneys to exterior of the body!

What is the functional unit of the nephron?

When is the end product of kidney

function?