1. Temperature Regulation
By the end of the lesson you will know
How the body corrects overheating
How the body corrects overcooling
What thermo receptors do?
What voluntary responses are carried out to control temperature

3. Why do we need to regulate: Internal body temperature
To provide the optimum conditions for enzymes and chemical reactions

4. Body Temperature Normal body temperature is 370C.
Temperatures above this:
denature enzymes and block metabolic pathways
Temperatures below this:
slow down metabolism and affect the brain.

5. Thermostats Temperature is set on a thermostat
Too cool? Heater kicks on and temperature goes up
Too warm? Heater stays off until room cools down
Constant checking : turning on and off

6. Homeostasis: feedback control of temperature
Feedback loop- A cycle
Conditions continually monitored,
brought into balance, re-monitored
etc.
( many homeostatic loops regulate our bodies)
Examples?
Examples
Blood sugar, heart rate, breathing rate, etc

7. 3 basic components of a feedback system
1) receptor(s)
Sensor(s) that reports a change (stimuli)
2) control center
evaluates input and sends output
3) effector
receives output to produce a response

8. Body Temperature Control
The Hypothalamus acts as a thermostat
Receives info from thermo receptors in the skin.
Receptors in the hypothalamus monitor blood temperature.

9. Primary skin response Vasoconstriction & Vasodilation

10. It’s too hot….
Vasodilation
Sweating

11. Cooling down When it's hot and you need to cool down, muscles relax.
Hairs lie close to the skin.
Air does not act as an insulating layer.

12. Cooling Down Sweating How does it work?
Heat energy in the body is absorbed by H20 converting liquid to gas.
Leaves the body cooler

13. It’s too cold…. Causes vasoconstriction. Shivering- burning fuel
To make heat

14. Keeping warm When it's cold, the muscle pulls the hair up.
A layer of warm air accumulates around the hair to insulate
Holds Heat

15. Voluntary responses
In humans our cerebrum “Knows” that we feel cold or hot
We then put on more clothes, eat a hot meal, exercise etc.

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