Chart the path of urine from the blood to the outside of the body.

Answer to q. 1

ANSWER: Urine (including its precursor compounds) would follow this path: Bowman's capsule,
proximal convoluted tubule, loop of Henle, distal convoluted tubule, collecting duct, ureter,
bladder, and finally out of the body via the urethra.

Answer to q. 2

ANSWER: On dry land, water conservation is an ever-present concern. Having dry skin and modifying
respirations are good strategies to prevent water loss. But, the key is to be able to filter toxins
from the fluids of the body without losing the fluids themselves. To this end, land animals
have evolved very efficient kidneys to filter metabolic waster and retain water.