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Biology Paper 2
Homeostasis
Thermoregulation
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Cards (21)
What does homeostasis maintain in the body?
Relatively constant
internal
conditions
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What is the normal human body temperature?
37
degrees Celsius
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What part of the brain monitors body temperature?
The
thermo regulatory center
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What do the receptors in the thermo regulatory center respond to?
The
temperature
of the blood
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How does the skin contribute to temperature monitoring?
It contains
temperature receptors
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What happens when body temperature gets too high?
The body
sweats
to cool down
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What is the process called when blood vessels dilate?
Vasodilation
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What occurs during vasodilation?
More blood flows through
capillaries
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How does the body cool itself down?
Heat transfers
out of the blood
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What happens when body temperature drops too low?
Blood vessels
constrict
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What is the term for blood vessels becoming narrower?
Vasoconstriction
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What happens to blood flow during vasoconstriction?
Less blood flows through
capillaries
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What is one way the body generates heat when cold?
Shivering
occurs
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What do skeletal muscles do during shivering?
Contract
to generate energy
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What increases in muscle cells during shivering?
The rate of
respiration
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What is released during increased respiration in muscle cells?
Heat
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What happens to sweating when body temperature falls too low?
We stop sweating
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How does the thermo regulatory center respond to temperature changes?
It
detects
changes and
initiates
responses
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What are the responses of the body to high body temperature?
Sweating to cool down
Vasodilation
to increase
blood flow
Heat transfer
from blood to skin
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What are the responses of the body to low body temperature?
Shivering to generate heat
Vasoconstriction
to reduce blood flow
Stopping sweating
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How does the control of body temperature exemplify homeostasis?
Thermo regulatory center
detects changes
Body initiates
responses
to restore normal temperature
Maintains stable internal environment
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