excretory system ‘urine’ good hands. the excretory system the structures involved: the...

Excretory Excretory SystemSystem‘‘Urine’ Good HandsUrine’ Good Hands

The Excretory SystemThe Excretory System

The Structures Involved:The Structures Involved:– Kidneys, Kidneys, – ureter, ureter, – bladder, bladder, – urethra, etc.urethra, etc.

The Excretory SystemThe Excretory System

AKA:AKA: The Urinary System The Urinary System Purpose:Purpose:

– to eliminate waste products (urea) or to eliminate waste products (urea) or unneeded substances from the bodyunneeded substances from the body

Ex:Ex: (do not write)(do not write) The breakdown of proteins leaves the The breakdown of proteins leaves the

amine group (NHamine group (NH22-) unused. It is -) unused. It is converted to ammonia (NHconverted to ammonia (NH33) in the liver, ) in the liver, which is extremely toxic, and then urea which is extremely toxic, and then urea ([NH([NH22]]22COCO22) which is less toxic. Blood ) which is less toxic. Blood carries urea to the kidneys for carries urea to the kidneys for elimination!elimination!

The Kidney & Urine The Kidney & Urine Formation:Formation:

4 Phases:4 Phases: FiltrationFiltration ReabsorptionReabsorption SecretionSecretion ExcretionExcretion

The Kidney & Urine The Kidney & Urine Formation:Formation:

Filtration:Filtration:– Renal arteries bring blood Renal arteries bring blood

to the kidneysto the kidneys– Blood travels to a nephron Blood travels to a nephron

which is surrounded by which is surrounded by capillariescapillaries

– Fluids to be processed Fluids to be processed enter Bowman’s enter Bowman’s Capsule from Capsule from blood (120 ml each blood (120 ml each min.) (Blood cells min.) (Blood cells cannot pass cannot pass through)through)

The Kidney & Urine The Kidney & Urine Formation:Formation:

The Kidney & Urine The Kidney & Urine Formation:Formation: Reabsorption:Reabsorption:

– Occurs in the “Loop of Henle” Occurs in the “Loop of Henle” 119 ml returned to the 119 ml returned to the blood, 1 ml becomes urine blood, 1 ml becomes urine (urine = 95% water, 5% urea, (urine = 95% water, 5% urea, salts, etc.)salts, etc.)

The Kidney & Urine The Kidney & Urine Formation:Formation:

The Kidney & Urine The Kidney & Urine Formation:Formation: Secretion:Secretion:

– Some other excess substances are Some other excess substances are actively transferred into the nephron actively transferred into the nephron for eliminationfor elimination

The Kidney & Urine The Kidney & Urine Formation:Formation:

The Kidney & Urine The Kidney & Urine Formation:Formation: Excretion:Excretion:

– Urine is carried by ureters to the Urine is carried by ureters to the bladder for storage (200 ml = first bladder for storage (200 ml = first warning, 400 ml = second warning, warning, 400 ml = second warning, 600 ml = too late!)600 ml = too late!)

– When it is time, urinary sphincter When it is time, urinary sphincter opens & urine enters urethra & exits opens & urine enters urethra & exits bodybody

The Kidney & Urine The Kidney & Urine Formation:Formation:

QUIZ: Label!QUIZ: Label!

A: Renal arteryA: Renal arteryD: Bowman's D: Bowman's CapsuleCapsuleE: GlomerulusE: GlomerulusG: Loop of HenleG: Loop of HenleI: Collecting I: Collecting TubuleTubule

Kidney-Related Diseases:Kidney-Related Diseases:

diabetes, Bright’s disease, kidney diabetes, Bright’s disease, kidney stones, etc. stones, etc.

SUMMARIZE using Pg. 213 text SUMMARIZE using Pg. 213 text

The End!!!The End!!!