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Excretion
Why is the process of excretion
necessary?
1. Name this process.
Copy
2. Name the end
products (hint there
are three).
3. Why are these end
products?
video
The process of
releasing cellular
wastes from an
organism.
• water
• perspiration
•urine
•carbon dioxide
Why is
excretion
necessary for
our cells
survival?
a.) they must continually
intake and output
water….maintain water
balance
b.) export molecules or
the cell gets bigger and
bigger
c.) dispose of waste
products that are toxic
(cell metabolism)
video
Kidneys
Urinary
system
Lungs
Respiratory
system
Skin
Integumentary
system
Liver
Digestive
system
What is the DIFFERNCE …..
Excretion or Egestion?
EXCRETION
material NOT used within
the cell.
removal of cellular waste
(Nitrogenous waste)
EGESTION
material NOT used in digestive
system.
removal of undigested waste
Solid wastes (feces)
ANY COMPOUND OR MIXTURE
THAT CONTAINS NITROGEN.
1. AMMONIA
2. UREA
3. URIC ACID
LUNGS
• 2 organs protected
ribs
by your _____.
• Main functions:
1. gas exchange
2. Excrete the
wastes from
RESPIRATION:
&
video
•Largest organ
inside the body
•Responsible for
DETOXIFYING
THE BLOOD
•It takes
TOXINS out of
the blood.
•In direct contact with
environment
•Acts as a barrier
•Is the largest organ of
the human body
epithelial
•Made of __________
tissue
•Regulates body
temperature with sweat!
vide
Do Now:
Explain this
cartoon using
as many
scientific
terms/phrases
as possible.
Excretion
How are humans adapted for
excretion? PART 2
Do Now:
summary
Summary:
1. Organ?
2. Removes?
Excretion
Respiratory
system
Digestive
Urinary
system
system
Integumentary
system
Lungs
Liver
Kidneys
Skin
Carbon dioxide
Produces Urea
Produces Urine
Perspiration
Organs of the
Human Urinary
System
Flow of Urine through the Urinary System
1
2
3
4
•2 bean shaped organs
•Located in the back of
the abdomen, near the
bottom ribs
•Organ responsible for
filtration of wastes out
of the blood
•Produce urine
video
When water, salts,
urea, glucose,
amino acids
diffuse out of the
blood stream into
the kidneys
When materials
flow through the
kidneys, some
materials may be
reabsorbed into
the capillaries
To replace any
substances that
need to be in the
bloodstream
Examples
Glucose, water,
Amino acids
a.) water
b.) urea
c.) salts
Is a nitrogenous
compound that is the
end product of
protein digestion
From the liver
Tubes that are connected
to the kidneys and the
urinary bladder
Responsible for
transporting urine
A muscular organ that is
connected to the
urethra and the ureters
Responsible for storage
of urine until elimination
A tube connected to the
urinary bladder and in
direct contact with the
environment
Responsible for
elimination of urine
•Act as a physical barrier
from the outside
environment
•Regulate body
temperature
•Excretion of perspiration
•Similar to the
Cell membrane
____________________
of a unicellular organism
Sweat gland: gland
that produces and
secretes (releases)
sweat.
Capillaries: blood
vessels that allow the
exchange of various
nutrients and wastes
among cells.
Excretion
How does the excretory system
malfunction?
handout.
Normal Kidney
Abnormal Kidney
1. Jaundice: Metabolic waste of bile are
reabsorbed by blood, while bile is not
secreted properly. Causing a yellowing of
the skin and eyes.
2. Gout: Uric acid deposits in
joints.
• Rich diet of purines (high protein) and
excessive drinking
2. Kidney Stones: Various substances
crystallize out of urine into urinary tract
or kidney and do not pass through
urethra.
3. Kidney Failure:
Inability of kidney to filtrate and
absorb nutrients properly. Excess
waste and fluids build up in the
body- death occurs if not treated.
• Dialysis acts as an artificial kidney. There are
two types of treatment: hemodialysis and
peritoneal (sac around the abdominal organs)
dialysis.
• About 90 percent of dialysis patients receive
hemodialysis: the blood is circulated outside the
body and cleaned inside a machine before
returning to the patient.
What is this?
LIVER
What’s wrong with these livers?
CIRRHOSIS
4. CIRRHOSIS: is scarring of the liver and poor liver
function as a result of chronic liver disease.
Causes: excessive DRINKING
of ALCOHOL
LAB
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