10/19/15
Date:
10/19/15
Topic:
Homeostasis
Page # ___
Date:
10/19/15
Topic:
Homeostasis
Page # ___
Today in Room 315…
ADMIT SLIP: Read “Tougher Than the Sun?”
HW: Write a story about a time your body had to maintain homeostasis
CONTENT OBJ: SW recognize that the body’s systems interact to
maintain homeostasis, and brainstorm examples of these processes
LANG. OBJ: SW write a story of how their body maintained homeostasis
in an extreme environment
ANNOUNCEMENTS: Grades updated & posted
AGENDA:
Read “Tougher than the sun?”
Define homeostasis
Introduce Nervous System
Brain charades
Discuss Feedback loops
EXIT SLIP: Give an example of a positive or negative feedback loop from
everyday life
Tougher Than the Sun?
Student overview (what was it about?)
What stresses from the external environment did
Josh’s body (his internal environment) have to
balance?
How did the choices that Josh made affect how
his body was being stressed by the external
environment?
What better choices could he have made?
What about Molly??
What symptoms did Molly show that were evidence
that her body (her internal environment) was under
stress from the conditions outdoors (her external
environment)?
Maintaining body
temperature:
Humans vs. Lizards?
Maintaining Body Temperature*
Endotherms: Animals which create their own
heat (Ex?)
Ex. mammals & birds
Ectotherms: Animals which receive heat
primarily from external environments (Ex?)
Ex. Amphibians, reptiles, fish
Brainstorm Competition
As a group, come up with ways organisms
maintain a stable internal environment, even
when the external environment is changing
Think of humans, other mammals, reptiles, etc.
Group that comes up with the most, wins!
You have three minutes- go!!!
Brainstorm Share Out
Groups count how many ideas they created
Group with the highest list reads
Anyone contest (disagree)?
Other groups contribute ideas
Homeostasis*
Definition?
“The tendency of the body to maintain stable
internal conditions, even as the external
environment changes”
Ex. Cold outside  Body shivers
Clip:
https://www.youtube.com/watch?v=9RLnlXNlfdk
What else??
Components of Homeostasis*
-temperature
Maintaining Homeostasis
How does our body do it??
Nervous System!
Control center???
Nervous system*
Two parts of the nervous system
Central nervous system
Brain ***
Spinal column
Meaning edge, outside, or outskirts
Peripheral nervous system
Nerve fibers/tissues
Brain vs. Mind
Brain and homeostasis?
How is the brain responsible for maintaining
homeostasis? Examples?
(Which part of the brain?)
Major Parts of the Brain*
Cerebrum
Cerebellum
Brain Stem
Draw and label in
your notebook!
Cerebrum*
Movement
Reasoning
Touch
Problem solving
Vision
Emotions
Hearing
Learning
Judgment
Body temperature
Cerebellum*
Controls movement
Voluntary muscle movement
Fine motor skill
Posture, balance
Brain Stem*
Controls the vital functions
Involuntary movements:
Cardiac function
Breathing
Swallowing
Eye movement
Hunger
Specialized Region*
Located below the cerebrum is a specialized
part of the brain called the hypothalamus
Hypothalamus regulates many
physiological processes important
to homeostasis
Examples include…
water balance, body temp,
feeding, sleep, and
endocrine functions
Brain Game: Charades
Each person will come up and be told an action to
do.
The class will then guess which part of the brain is
responsible.
Options:
Cerebrum, cerebellum, brain stem, hypothalamus
Take 2 minutes to
discuss/decide with your
partner
Which part of the brain? Why?
Holding a pencil
Walking
Pumping blood
Deciding if you should
jump the fence
Standing on one foot
Feeling sad
Following a finger with
your eyes
Taking medicine
Wanting an apple across
the room and going over
and eating it
Revisited…
So which parts of the brain are responsible
here? …
Homework
In your journal, describe a time that
you experienced harsh external
conditions, what your body did to
maintain homeostasis, and which
part of your brain was at work.
Ex. Shoveling in 5 degree weather, your body shivered (though you
also had a coat), and your cerebrum maintained your temp.
Tell a full story!!! Make it up if needed.