Homeostatis 4 themes notes

2. B
A
L
A
N
C
E
Teacher Notes
 Notes can be taken from this PPT on
notebook paper.
 Certain slides have a leading question in
red. The red questions indicate that notes
on the data that would answer the
question should be taken.

3. B
A
L
A
N
C
E
The Body in Balance
 Maintains constant
body temperature
 Maintains the level of
glucose in the blood
 Maintains the level of
salt, water and sugar in
the blood
C6H12O6

4. B
A
L
A
N
C
E
So…..
 What do we call this maintenance of
a balanced internal environment?
Homeostasis
What is homeostasis?

5. B
A
L
A
N
C
E
4 Major Themes
in Maintaining Balance
 These 4 major themes are
interrelated to help your body
maintain homeostasis:
• Feedback loops
• Structure and function
• Division of labor
• Interdependence of organ
systems
What four themes help maintain homeostasi

6. B
A
L
A
N
C
E
Feedback Loops
 How does the thermostat in
your home maintain a
constant temperature?

7. B
A
L
A
N
C
E
Feedback Loops
Thermostat shuts
off heater
Room
temperature
falls
Thermostat
activates
heater
Warm air is
produced
Room
temperature
rises
Thermostat
feedback loop

8. B
A
L
A
N
C
E
Feedback Loops
 What happens to your body
when you run outside in
100o
temperature?

9. B
A
L
A
N
C
E
Feedback Loops
 How does this happen?
Blood vessels
in skin
dilate
Sensors in the brain and skin detect
a change in body temperature
Sweat glands
release more
sweat
Body temperature
regulates
stimulus
response
 This is a stimulus-response
Hormone
message sent

10. B
A
L
A
N
C
E
Feedback Loops
 A feedback loop is a stimulus-
response action.
 An environmental change (the
stimulus) produces a reaction
(response) to put the environment
back into balance (homeostasis).
What is a feedback loop?

11. B
A
L
A
N
C
E
Feedback Loops
So….What are some of the things
that feedback regulates?
 Feedback systems regulate:
• Blood sugar (glucose)
• Salt content in blood
• Hormone production
• Blood pressure
• Ion content in blood
• Water content in blood

12. B
A
L
A
N
C
E
Structure and Function
 TRY THIS!
 Put a rubber band around your
hand so that the thumb cannot be
used. Pick up your textbook and
hand it to the student next to you.
 Now - pick up a penny without
going to the edge of the desk or
putting the penny up against
something.

13. B
A
L
A
N
C
E
Structure and Function
 TRY THIS!
 Continue to not use
the thumb. Try to
unscrew a lid from a
jar.
 Pick up your pencil
and write your name
without using your
thumb.

14. B
A
L
A
N
C
E
Structure and Function
 Why are these harder to do without
the thumb?
 What are some other activities that
would be difficult without your
thumb?

15. B
A
L
A
N
C
E
Structure and Function
 How is the
structure of your
thumb related to
its function?

16. B
A
L
A
N
C
E
Structure and Function
 One of these
represents an
original native of
Africa.
 One of these
represents an
original native of
Alaska.
 Which is which and
why?

17. B
A
L
A
N
C
E
Structure and Function
 What is the function
of plant leaves?
 Why are these
leaves shaped
differently?
Maple leaf
Conifer
Cactus

18. B
A
L
A
N
C
E
Structure and Function
 The dolphin and the
fish are unrelated
organisms.
 Why do they have
similar structures?
Mammal - dolphin
Fish – Queen snapper

19. B
A
L
A
N
C
E
Structure and Function
 The shape (structure) of
something affects how it works
(function).
What is meant by structure is
related to function?

20. B
A
L
A
N
C
E
Division of Labor
 How many people
does it take to
build a building?

21. B
A
L
A
N
C
E
Division of Labor
 You would need:
• Architect
• Construction workers
• Foreman
• Plumbers
• Electricians
• Painters
 Why do you need all of
these people?

22. B
A
L
A
N
C
E
Division of Labor
 Why do you need
so many different
parts to digest
your food?

23. B
A
L
A
N
C
E
Division of Labor
 What do your
teeth do for you?

24. B
A
L
A
N
C
E
Division of Labor
Esophagus
 Why do you need
an esophagus?

25. B
A
L
A
N
C
E
Division of Labor
 Does the stomach
do anything special
for you?

26. B
A
L
A
N
C
E
Division of Labor
 Could you live without your
small intestine?
 Why?

27. B
A
L
A
N
C
E
Division of Labor
 Your body systems are divided
into different parts.
 Each part has its own special
function.
 This is called a Division of Labor.
What is division of labor?

28. B
A
L
A
N
C
E
Interdependence
of Body Systems
 REMEMBER . . .
 All the body systems work
together to maintain
homeostasis.

29. B
A
L
A
N
C
E
Interdependence
of Body Systems
 What systems need to work
together in order for you to
write your name on a sheet of
paper?

30. B
A
L
A
N
C
E
Interdependence
of Body Systems
 What systems need to work
together so you can get energy
from the food you eat?

31. B
A
L
A
N
C
E
Interdependence
of Body Systems
 What would happen if . . .?
 You tried to move your
leg with a broken femur?
 You had too few red
blood cells?

32. B
A
L
A
N
C
E
Interdependence
of Body Systems
 All the body systems rely on
each other in order to function
correctly.
 If one system fails to work, every
system will be affected.
 This shows the interdependence
of all the systems.
What is interdependence of body systems

33. B
A
L
A
N
C
E
Let’s review:
 Explain homeostasis and why it is
important.
 Explain feedback loops and give
examples.
 Why is structure related to function?
Why is surface area a part of
structure?
 What does division of labor mean?
 Why is it important for all of your
body systems to work together?