Homeostasis - staying in balance
Task
Answer the following questions.
1. What does the word homeostasis mean? ......................................................
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2. Our bodies have to keep three important internal conditions balanced, what are
they?
i)
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ii) ....................................................................................................
iii) ....................................................................................................
Too hot or too cold?
3. Explain what happens to your body when you get too hot:
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4. Explain what happens to your body when you get too cold:
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Homeostasis - staying in balance
5. Complete the diagram below using the words: increase, decrease, 37
................................
in temperature
Core temperature
............................. ⁰C
Shivering, hairs stand on
end and decreased blood
flow to the skin leads to an
...............................
in temperature
Too hot
Negative
feedback
Sweating, hairs lie flat, and
increased blood flow to the
skin leads to a
..............................
in temperature
Core temperature
............................. ⁰C
................................
in temperature
Too cold
6. How can the core body temperature be measured?
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7. Very high and very low body temperatures
If you get too cold you can develop
If you get too hot you can develop
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Homeostasis - staying in balance
8. Blood glucose levels
Use the keywords below to complete the paragraph.
inject
sugar
pancreas
hormone
food
diabetes
levels
blood
insulin
Some people suffer from a disease called ............................. . They do not produce
enough of a ...................... called .................... from the organ in the body called
the .......................... . Insulin controls the ..................... .................. levels.
Diabetics have to be careful that they do not eat too much sweet ........................ .
They may also need to ............................. themselves with the hormone insulin to
help control their blood sugar .............................. .
9. What is a hormone?
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Homeostasis - staying in balance
Answers
1. The maintenance of a constant internal environment
2.
i) water
ii) blood sugar
iii) temperature
3. Too hot: Sweat – water evaporates from skin takes heat with it
Blood vessels dilate – brings blood to surface and loses heat
Hairs lie flat – no insulation – catch breeze
Consciously take off layer of clothes /turn thermostat down
4. Too cold: Stop sweating – no heat loss
Blood vessels constrict – less blood to cold surroundings – keep warm
Hairs stand on end – trap air – insulates
Consciously – turn heating up/ put coat on
5.
Too hot
Increase
in temperature
Core temperature
37⁰C
Shivering, hairs stand on end
and decreased blood flow to
the skin leads to an increase
in temperature
Negative
feedback
Sweating, hairs lie flat, and
increased blood flow to the
skin leads to a decrease
in temperature
Core temperature
37⁰C
Decrease
in temperature
Too cold
6. Thermometer or temperature strip across head
7. If you get too cold you can develop
frostbite or hypothermia
If you get too hot you can develop
heat stroke
8. Blood glucose levels
Some people suffer from a disease called diabetes. They do not produce enough of a hormone
called insulin from the organ in the body called the pancreas. Insulin controls the blood sugar
levels. Diabetics have to be careful that they do not eat too much sweet food. They may also
need to inject themselves with the hormone insulin to help control their blood sugar levels.
9. A chemical released by a cell or a gland in one part of the body that sends out messages that
affect cells in other parts of the organism
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