Excretory System

Question 1

Functions

Answer 1

-filters the blood
-allows waste products to be removed
-prevents toxicity

Question 2

Excretory system in mammals

Answer 2

-Consists of kidneys, ureter, bladder, sphincter and urethra.
-have nephrons next to the collecting duct in the kidney-consists of renal corpsule where first filtration of the blood takes place.

Question 3

Excretory system in birds

Answer 3

-dont have a urinary bladder
-carry urine from the kidneys to the cloaca

Question 4

Nitrogenous waste removal

Answer 4

-removes nitrogenous waste products such as ammonia,salt and water
-they come from the breakdown of proteins

Question 5

NWR- Birds

Answer 5

-remove ammonia in the form of uric acid
-does not require water and is an insoluble substance

Question 6

NWR- Mammals

Answer 6

-remove ammonia in the form of urea
-requires water to allow it to be secreted as urine

Question 7

3 layers of the kidneys

Answer 7

-cortex
-medulla
-capsule