+

Excretory system (Urinary)

Junghyun Kim &

Carol Choo

+Excretory VS. Urinary

Elimination of metabolic waste skin (sweat glands) lungs (CO2 byebye)

Liver hemoglobin molecule from RBC bile Ammonia urea

Kidney (urinary system)

+So… what does the urinary system do?

Cleaning the blood (metabolic wastes) Elimination of nitrogenous wastes Excess solutes (ionic concentration) Excess water (osmoregulation)

+#1: Nitrogenous wastes

Nitrogen-containing molecules

Ammonia (NH3) Highly toxic & soluble

in water. From cells breakdown

of old proteins Broken down

ammonia liver ureakidney

Remains of drug

+#2: Ionic concentration#3: Osmoregulation

Minerals serve as cofactors

Too much is problem Na+ (salt), K+, Mg++, etc.

Water level in body

+Water= - ionic con. / -Water= +ionic con.

+HOW does my pee form?

Filtration Urea, water, glucose, and other materials are filtered

out of the blood.

Reabsorption Most fluid and some solutes are

selectively reabsorbed from the filtrate.

Excretion Urine w/nitrogenous wastes

(urea and uric acid) byebye!

+Keep my body BALANCED!

Fluid balance the volume of water

Mineral balance the concentration of many ions

Acid-base balance the concentration of H+ and OH (pH level!!!!!!!!!)

Calcium balance

Elimination of nitrogenous wastes from cellular metabolism

+WOW! Factsssss :P

1.3 million nephrons

2 kidneys =1100 ~ 2000 L of blood/day =volume of a car!

800 ml~ 2000ml of urine a day

Once every 4 min. entire 5.6L of blood pass kidney!

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