Download The Excretory System - Milton

The Excretory System
Function:
A. Of what is waste composed?
Nitrogen-containing substances like . . .
1.
2.
3.
4.
And other wastes such as . . .
5.
6.
7.
8.
B. Which organs secrete these wastes?
1. Sweat glands
a. Perspiration is made up of __________,
_______, and ________
b. The purpose of sweating is to cool down the
body not ___________
2. Liver
a. Excretes _______ pigments like _________
That are deposited into the blood
b. Urochrome gives ______ its yellow color
3. Lungs
a. Expiration produces ________________ and
_______ as byproducts (moisture on a
mirror)
4. Kidneys
a. Produces ___________
b. Major organ of the __________ system.
Other organs include . . .
C. Structure of the Kidney (Diagram)
1. Layers
a. Outer =
b. Middle =
c. Inner =
2. Within kidneys are nephrons (renal tubules)
a. Cortex = Bowman’s Capsule
b. Cortex =
c. Medulla =
d. Cortex =
e. Medulla =
D. How is urine formed? (Diagram)
1. Pressure filtration
a. _________ enters the glomerulus
b. Filterable blood components enter ________
___________; these include water, nitrogenous
waste, nutrients, salts (ions)
*What stays in the blood?
2. Selective reabsorption
a.In ____________ ___________
____________, sodium ions are reabsorbed
actively while water and chloride ions and glucose
follow passively
b.Molecules that are reabsorbed enter the
bloodstream through the _____________ ______
____________ that surrounds the nephron
c. Nonreabsorbed fluids enter the loop of _______
(some water, nitrogenous wastes, excess salts)
3. Tubular excretion
a.Hydrogen, ammonium ions, creatinine, and some
drugs move from __________ __________
_______ to _________ convuluted tubule
b.Water is reabsorbed along the entire _________
4. Composition of urine
a.
b.
c.
d.
e.
f.
g.
h.
i.
j.
k.
l.
m.