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Unit 3 - Thermoregulation
When we are too cold, hairs trap a layer of air for insulation.

Unit 3 - Thermoregulation

Have you ever wondered how we manage to keep cool on hot days or to stay warm when it's snowing? The answer is thermoregulation. Thermoregulation is the control of the internal body temperature in warm blooded animals (birds and mammals - including humans) and in this GCSE Biology quiz we find out exactly how thermoregulation works.

The body temperature of a warm blooded animal must be kept within precise limits so that the organism can still function. In humans, if the body temperature is too high, for example during a fever, dehydration and heatstroke can occur. If the fever is not reduced, eventually the patient will die. The same happens with a low body temperature and is more commonly referred to as hypothermia or exposure. So, how does the body manage to control its temperature?

1.
Temperature receptors are found in the brain and also in the...
liver
heart
skin
mouth
Skin temperature is constantly monitored
2.
Thermoregulation is the control of body...
fluids
glucose
temperature
pH
Thermoregulation is an example of homeostasis
3.
This happens when it is cold in order to generate heat from respiration.
Seizures
Crying
Yawning
Shivering
Muscles are made to vibrate and this extra work that they do releases more heat and warms up the blood passing through the muscles
4.
During sweating, body temperature...
decreases
increases
remains the same
decreases and then increases
Sweating cools us down, therefore body temperature is decreased back to normal
5.
What is the normal core body temperature for humans?
36 degrees C
37 degrees C
38 degrees C
39 degrees C
It is the core body temperature that matters
6.
Information about skin temperature is sent to the brain by...
nerve cells
heart cells
brain cells
muscle cells
Nerves are the fast messaging system of the body, so the thrmoregulatory centre can respond quickly if needed
7.
The part of the brain which is involved with temperature control is called the...
osmoregulatory centre
thermoreceptor centre
thermoregulatory centre
cortex
'Thermo' indicates something to do with temperature and 'regulatory' indicates the centre is something to do with control
8.
When we are too cold, these trap a layer of air for insulation.
Hairs
Mucus
Sweat glands
Capillaries
The idea is that they trap a layer of air against the skin for insulation. Humans have a lot less skin hair than most mammals and so this is not particularly effective
9.
Which process cools the skin during sweating?
Transpiration
Respiration
Condensation
Evaporation
Sweat contains a lot of water and this evaporates, turning from a liquid into a gas. This takes heat energy away from the body and cools us down
10.
Receptors inside the thermoregulatory centre detect blood...
pH
oxygen
temperature
pressure
The blood flowing through the thermoregulatory centre has been heated by passing through the body
You can find more about this topic by visiting BBC Bitesize - Homeostasis in humans

Author:  Donna Maria Davidson

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