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Homeostasis 4 themes ppt
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Transcript of Homeostasis 4 themes ppt
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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.
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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
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So…..
What do we call this maintenance of a balanced internal environment?
Homeostasis
What is homeostasis?
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4 Major Themesin 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 homeostasis?
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Feedback Loops
How does the thermostat in your home maintain a constant temperature?
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Feedback Loops
Thermostat shuts off heater
Room temperature
falls
Thermostat activates
heater
Warm air is produced
Room temperature
rises
Thermostat feedback loop
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Feedback Loops
What happens to your body when you run outside in 100o temperature?
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Feedback Loops How does this happen?
Blood vesselsin skindilate
Sensors in the brain and skin detecta change in body temperature
Sweat glandsrelease more
sweat
Body temperatureregulates
stimulus
response
This is a stimulus-response
Hormone message sent
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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?
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Feedback LoopsSo….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
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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.
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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.
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Structure and Function
Why are these harder to do without the thumb?
What are some other activities that would be difficult without your thumb?
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Structure and Function
How is the structure of your thumb related to its function?
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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?
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Structure and Function What is the function
of plant leaves?
Why are these leaves shaped differently?
Maple leaf
Conifer
Cactus
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Structure and Function
The dolphin and the fish are unrelated organisms.
Why do they have similar structures?
Mammal - dolphin
Fish – Queen snapper
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Structure and Function
The shape (structure) of something affects how it works (function).
What is meant by structure is related to function?
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Division of Labor
How many people does it take to build a building?
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Division of Labor
You would need:• Architect• Construction workers• Foreman• Plumbers• Electricians• Painters
Why do you need all of these people?
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Division of Labor
Why do you need so many different parts to digest your food?
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Division of Labor
What do your teeth do for you?
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Division of Labor
Esophagus
Why do you need an esophagus?
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Division of Labor
Does the stomach do anything special for you?
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Division of Labor
Could you live without your small intestine?
Why?
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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?
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Interdependence of Body Systems
REMEMBER . . .
All the body systems work together to maintain homeostasis.
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Interdependence of Body Systems
What systems need to work together in order for you to write your name on a sheet of paper?
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Interdependence of Body Systems
What systems need to work together so you can get energy from the food you eat?
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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?
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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?
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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?