Transcript Review Excretory System

Review Excretory
System
Be able to label the structures of the
Excretory System
 Kidneys
 Ureters
 Urethra
 Urinary Bladder
Know the four organs of excretion
 Kidneys
 Lungs
 Liver
 Skin
Lungs
 As respiration occurs carbon dioxide is
produced as a waste product. As the carbon
dioxide accumulates in body cells, it eventually
diffuses out of the cells & into the bloodstream,
which eventually circulates to the lungs. And
here, in the alveoli of the lungs, carbon dioxide
diffuses from the blood, into the lung tissue,
and then leaves the body every time we exhale.
Liver
 Some proteins & other nitrogenous
compounds are broken down in the liver.
 As a result of these reactions, a
nitrogenous waste called urea is formed.
 Largest organ in the body; helps the
digestive, excretory and circulatory
system
Skin
 As you already know, sweat comes out of
pores in your skin. As you may not know,
sweat is a mixture of three metabolic
wastes: water, salts, & urea. So as you
sweat, your body accomplishes two things:
1) sweating has a cooling effect on the
body, and 2) metabolic wastes are excreted
Kidneys
 Three of the four major metabolic wastes
produced by the body are filtered from the blood
by the kidneys. They are water, salts, & urea (the
4th, carbon dioxide, is excreted by the lungs,
remember?).
 These are the same three wastes that sweat glands
filter & excrete. So, yes, sweat & urine are made
basically from the same ingredients (except in
different concentrations).
Review
(answer is liver, lungs, kidneys or skin)
1. excretes salts from its surface
2. responsible for excreting carbon dioxide
3. has functional units called nephrons
4. produces both urea & bile
5. organ in which blood loses urea & reabsorbs
glucose and amino acids
6. removes old red blood cells from the
circulatory system
7. maintains homeostasis by removing body heat,
water, & other wastes
8. adds or removes glucose from the blood as
necessary
1. excretes salts from its surface - SKIN
2. responsible for excreting carbon dioxide LUNGS
3. has functional units called nephrons KIDNEYS
4. produces both urea & bile - LIVER
5. organ in which blood loses urea &
reabsorbs glucose and amino acids KIDNEYS
6. removes old red blood cells from the
circulatory system - LIVER
7. maintains homeostasis by removing body
heat, water, & other wastes - SKIN
8. adds or removes glucose from the blood
as necessary - LIVER
9. Which is the correct pathway for the
elimination of urine?
a) urethra, ureter, bladder, kidney
b) kidneys, urethra, bladder, ureter
c) bladder, ureters, kidney, urethra
d) kidneys, ureters, bladder, urethra
9. Which is the correct pathway for the
elimination of urine?
a) urethra, ureter, bladder, kidney
b) kidneys, urethra, bladder, ureter
c) bladder, ureters, kidney, urethra
d) kidneys, ureters, bladder, urethra
10. A blockage in a ureter
would
Interfere with:
a) urine entering the kidney
b) urine entering the bladder
c) urine leaving the body
d) urea entering the kidney
10. A blockage in a ureter
would
Interfere with:
a) urine entering the kidney
b) urine entering the bladder
c) urine leaving the body
d) urea entering the kidney
11. In addition to water, the
principal components of urine
are:
a) amino acids & fatty acids
b) urea & salts
c) ammonia & bile
d) hydrochloric acid & urea
11. In addition to water, the
principal components of urine
are:
a) amino acids & fatty acids
b) urea & salts
c) ammonia & bile
d) hydrochloric acid & urea
Resources
Textbook & Workbook (Section 13-3)
Activity: The Kidneys
Activity: Urine Analysis
Notes: Excretory System