Structures of the Excretory System
The Skin
� Sweat glands produce sweat, which
functions as a temperature control and
pheromone release
� Sweat also produces salt
Lungs
� The lungs diffuses gaseous wastes
-carbon dioxide
� The waste is diffused from the
bloodstream as a normal part of
respiration
Kidneys
� The kidney eliminates wastes from the
bloodstream by the production of urine
� Nephrons are the basic structural and
functional unit of the kidney
-There are over 1 million nephrons in
each kidney
-act as filters inside the kidneys
Ureter
� The ureters are muscular tubes that take
urine from the kidneys to the urinary
bladder
Urinary Bladder
� The urinary bladder collects urine created
by the kidneys
� The urinary bladder is located on the
pelvis floor
Urethra
� connects the urinary bladder to the
outside of the body. In humans.
Excretion and the KidneysExcretion is the process by which waste
products and other non-useful materials are eliminated from an organism.
When waste blood enters the kidney, urea and excess water are removed by units called nephrons.
Excretory in depth
� As your body performs the many functions
that it needs in order to keep itself alive, it
produces wastes. These wastes are
chemicals that are toxic and that if left
alone would seriously hurt or even kill you.
Continued…
� The excretory system is a biological system
that removes excess and unnecessary
materials from an organism, to help
prevent damage to the body.
Continued…
� The excretory system removes liquid toxic
wastes as well as excess water from the
organism, in the form of urine.
The Kidneys
and
HomeostasisThe Kidneys respond directly to the composition of the blood. They are also influenced by the endocrine system. Disruption of proper kidney function can lead to serious health problems.
Homeostasis
� Tendency of an organism or a cell to
regulate its internal conditions so as to
stabilize its health and functioning,
regardless of the outside changing
conditions.
Endocrine System
� System of glands that produce endocrine
secretions that help control bodily
metabolic activity.
Composition of Blood
� Blood is made up of red blood cells, white
blood cells, and platelets. The cells float in
a straw-colored liquid called blood
plasma.
Filtration
Shekinah & Dashawn
What is filtration?
� Passing a liquid or gas through a filter to
remove wastes. (a Filter)
Why is it used?� It’s a filter….
� Separate particles
� Break down things
How is it used in the excretory
system?
Where it occurs
� In the Kidneys where urine is made by filtering blood
What is filtered out
� Nitrogenous waste
� Nucleic acids
How filtration works
� Water and chemicals are squeezed through capillary walls as the heart pushes blood through the glomerulus
Different types of Filtration � Mechanical Filtration: Trapping of solids… � Biological Filtration: uses bacteria to breakdown waste..� Natural Filtration: Simplest filtration…records the “past behavior”� Water Filtration: to remove impurities from the water supplyAnd Many more!
Any
Questions?
?
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