1. To know how the body regulates its temperature.
What is your bodies normal temperature?
What happens if you are too hot?
What happens if you are too cold?

2. To know how the body regulates its temperature.
Success criteria-
State the normal internal body temperature and why this must be maintained.
Label the parts of the skin.
Describe how the body maintains a constant temperature.
Explain why thermoregulation is so important.
Construct negative feed back loops (H).

3. To know how the body regulates its temperature.
Humans live in a variety of temperatures.
Like all mammals, humans are endotherms (warm blooded).
Human body temperature must remain around 37⁰C.
-37⁰C= If the rate of enzyme controlled reactions in your cells falls too low, you don’t make enough energy & cells start to die.
+37⁰C= Denatures enzymes so can no longer catalyze reactions in cells.
Bodies try to maintain 37 degrees as this is the optimum conditions for enzymes.

4. To know how the body regulates its temperature.
State the normal internal body temperature and why this must be maintained.
Normal internal body temperature is…
If our bodies get too hot…
If our bodies get too cold…
Keywords:
enzymes
catalysts
denatured
optimum
slowed reactions

5. To know how the body regulates its temperature.
Function of skin
Lets take a closer look at the skin
Protects us from infection .
2. Keeps our body at the right temperature.
3. Covered in receptors so we can feel things.

6. To know how the body regulates its temperature.
Label the parts of the skin.
Hair
Erector muscle
Sweat gland
Blood vessels
Temperature receptor
Epidermis
Fat layer
Learners will put the labels in the correct place then write 1 function carried out by the

7. To know how the body regulates its temperature.
On a hot day the skin…
1. Vasodilation of Blood vessels.
Capillaries get wider so a Larger amount of blood can flow near the skin surface. Heat is lost to the environment.
2. Evaporation of sweat
Sweat is produced from the sweat glands. Sweat evaporates from the skin.
3. Hairs and hair erector muscles are relaxed.
4. No shivering

8. To know how the body regulates its temperature.
On a cold day…
1. Vasoconstriction of Blood vessels.
Capillaries get smaller so a smaller amount of blood can flow near the skin surface. Heat is kept near to the body.
2. No sweat is produced.
3. Body starts to shiver to produce heat for the body.
4. Hairs and hair erector muscles stand on end to trap a layer of air.

9. To know how the body regulates its temperature.

10. To know how the body regulates its temperature.

11. To know how the body regulates its temperature.
The hypothalamus receives nerve impulses from heat and cold thermoreceptors in the skin.
There are also receptors in the hypothalamus- called central thermoreceptors.
These detect changes in blood temperature.

12. To know how the body regulates its temperature.
In own words on mini whiteboards
Skin in cold conditions
Skin in hot conditions

13. Normal body temperature
To know how the body regulates its temperature.
Normal body temperature is restored
Normal body temperature

14. Normal body temperature
To know how the body regulates its temperature.
Vasodilation
Hairs lie flat
Body sweats
No shivering
Normal body temperature is restored
Vasoconstriction
Hairs stand on end
Body doesn’t sweat
Shivering occurs
Normal body temperature
The hypothalamus detects a rise in temperature
Body temperature falls
The hypothalamus detects a fall in temperature
Body temperature rises

15. To know how the body regulates its temperature.
Animal thermoregulation
Thermoregulation

16. To know how the body regulates its temperature.
Could be done…
Cotton wool
Dry towelling cloth
To know how the body regulates its temperature.
Set up the equipment as shown opposite.
Fill the conical flask with hot water from the kettle.
Record the temperature and start your stop clock.
Record the temperature every minute for 10 minutes. Record your data in a suitable table.
Time (mins)
Temperature (°C)
Dry Flask
Wet Flask
(START) 1
Repeat with a wet towelling cloth.

17. To know how the body regulates its temperature.
Success criteria-
State the normal internal body temperature and why this must be maintained.
Label the parts of the skin.
Describe how the body maintains a constant temperature.
Explain why thermoregulation is so important.
Construct negative feed back loops (H).
Why is thermoregulation so important?
Why might wearing antiperspirant be a bad thing?
What advice would you give to Bear Grylls for his next adventure in the desert?
Effective participants

18. To know how the body regulates its temperature.
Most people use antiperspirants to stop themselves sweating, but sweating is good.
It is one of the ways that your skin keeps the bodies internal temperature constant.
Not much air circulates under your armpits, so the sweat doesn’t evaporate easily anyway.
They do stop you smelling though!

19. To know how the body regulates its temperature.
You are a medic in charge of Bear Grylls next adventure in the desert. You must explain to him all the changes that will happen in his body and any steps he should follow to stay healthy. (6 marks)
Learners should discuss both as temperature fluctuates
8.38

20. To know how the body regulates its temperature.
Negative feedback
All homeostatic mechanisms use negative feedback to maintain a constant value (called the set point). Negative feedback means that whenever a change occurs in a system, this automatically causes a corrective mechanism to start, which reverses the original change and brings the system back towards the set point (i.e. ‘normal’).

21. Recap of negative feed back loop.
Insulin produced by the pancreas causes glucose to change to glycogen
Stored in the liver and muscles
Glucose rises (eat food)
Higher
Normal blood
glucose level
( mg/100cm3 blood)
Normal blood
glucose level
( mg/100cm3 blood)
Glucagon released and glycogen converted back to glucose
Glucose falls (exercise)

22. TOO HOT! TOO COLD! What the body does 1) 2) 3) Detected by 1) 2)
Normal temperature
What is this?
Normal temperature
What is this?
Students to make their own for
What the body does 1) 2) 3) 4)
TOO COLD!
Detected by 1) 2)

23. vasodilation
vasoconstriction