Transcript Homeostasis in Body Systems

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What is homeostasis?
Remember, one of the Characteristics of Life is homeostasis.
The process of keeping things the same is called homeostasis.
Many of the organ systems
of the body work together
automatically to ensures that
the body maintains a
constant temperature and
steady levels of blood
sugar, urea, CO2, ions, and
water.
Homeostasis allows the
body’s cells to work at
their optimum.
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Homeostasis – the balancing act
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The organs of homeostasis
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Homeostasis in the nervous system
• Receives sensory input,
• integrates and stores input,
• directs the body, and helps coordinate the
activities of all the other organ systems. It
responds quickly to internal and external
stimuli.
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How does this work?
• Receive sensory information in sensory
neurons.
• Transmit the message to the interneuron
(spinal chord and brain)
• Interneuron transmits what to do back to
motor neurons.
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How did this work in exercise?
• What did the nervous system tell your
brain?
• Write this down under “how does this
system help maintain homeostasis?”
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Like exercise!
The pH of the blood,
Making it too acidic!
Receive the info,
that the pH is too
low
Your nervous system
Your brain
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Your brain sends
a message to
the diaphragm
When the pH returns
to normal,
homeostasis is
restored!
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Endocrine System
• Coordinates and integrates the activities of
other systems by secreting hormones,
responding to stress, regulating fluid, pH
balance and metabolism.
• Works more slowly, with longer-lasting
effects than the nervous system.
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Look back at your worksheet from yesterday
• What is the endocrine system?
• How do the glands get their chemicals to
your cells that need them?
• Look at your internet paper on page 2,
what happens after you eat a candy bar?
How does this system help you to maintain
homeostasis?
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Maintaining safe glucose levels
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Circulatory/Respiratory
• From your foldable, decide what these
systems really do a lot of. (our major
focus last week, what 2 gases)
• How do these 2 systems maintain
homeostasis?
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Digestive System
• What did you learn from Monday and the
computer lab last Friday about digestion?
• What does this system do? Write this
down in your notes, and put your picture
here.
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Digestive System
• Absorbs soluble nutrients after ingesting
food and digesting it,
• Eliminates nondigestible remains.
• Supplies blood with nutrients and water for
tissue cells.
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Small Intestine
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Villi in the Small Intestine
• Small so how does this help with
diffusion?
• Absorption takes place here, what is
wrapped around the Villi?
• So does the circulatory/cardiovascular
only send around the gases?
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Excretory System
• http://www.biologymad.com/resources/kid
ney.swf
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Excretory System
• What is this system responsible for then?
How does it maintain homeostasis?
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• Removes nitrogenous and other metabolic
wastes from the bloodstream by excretion,
• helps control fluid balance, as well as the
water-salt, and acid-base balance of the
blood.
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