7.4 Temperature Control Flashcards
What is Thermoregulation?
Control of the body temperature.
When is the core body temperature stable?
37.5
Why is it important for the body temperature to be at 37.5?
So enzyme controlled reactions can occur at a reasonable rate.
What would be the effect of a lower temperature and higher temperature?
The enzyme reaction would be too slow.
The enzyme would denature.
What on the skin detects temperature changes?
Thermoreceptors.
What happens when the skin is warm?
Impulses are sent to the hypothalamus initiating heat loss response by inhibiting heat fain response/
What is temperature maintained by?
The negative feedback system.
What do receptors in the blood detect?
Temperature.
Where are receptors located?
The structure in the brain called the hypothalamus which acts as a control mechanism acting as a thermostat turning on effectors.
Heat Loss Center: Stimulate (1)
Sweat glands to secrete sweat.
Heat Loss Center: Inhibits (4)
- Contraction of the arterioles in skin (Dilates capillaries in the skin).
- Hair erector muscles (Relax hairs lie flat)
- Liver (Reduces metabolic rate).
- Skeletal muscles relax (no shivering).
Heat Gain Center: Stimulates (4)
- Arterioles in the skin to constrict.
- Hair erector muscles to contract.
- Liver to raise metabolic rate.
- Skeletal muscles to contract shivering.
Heat Gain Center: Inhibits (1)
Sweat glands.
What does the skin help control? (4)
Sweating, hair attitude, route of blood flow, shivering.
What is shivering?
Uncontrollable contraction of normally voluntary muscles.
