B1 Staying in balance

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Whats is Homeostasis and what does it involve?
Homeostasis: Keeping constant internal environment. Involves balancing bodily inputs and outputs
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What keeps the level temperature, water and carbon dioxide steady?
Automatic control systems
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What do negative feedback systems do?
They act when conditions change from the ideal or set point and returns conditions back to this set point
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The body temperature is...
37 degrees celsuis
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A high temperature can cause...
1) Heat stroke (pulse is rapid but weak) 2) Dehydration
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What does the body do to avoid overheating?
The body sweats to increase heat transfer from the body to the environment
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Why does the evaporation of sweat require body heat?
To change the liquid sweat into water vapour
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A very low temperature can cause...
Hypothermia (pulse is slow with violent shivering)
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What is blood temperature monitored by?
The hypothalamus gland in the brain
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Reaction to temperature extremes are controlled by...
The nervous and hormonal systems - these trigger vasoconstriction or vasodilation
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What happens during Vasoconstriction?
Body too cold -> small blood vessels narrow -> less blood flow -> heat loss reduced
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What happens during Vasodilation?
Body too hot -> small blood vessels widen -> blood flow increases -> more blood flow near skin surface -> more heat transfer (heat is lost)
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Which hormone controls blood sugar levels?
Insulin
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Is hormone action slower or nervous reactions? Why?
Hormone action because hormones travel in the blood
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What is Type 1 diabetes caused by and how is it treated/controlled?
Caused by the pancreas not producing any insulin. Treated by doses of insulin
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What is Type 2 diabetes caused by and how is it treated/controlled?
Caused by body producing too little insulin or body not reacting to it. Controlled by diet
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Blood sugar level is regulated by...
Glycogen (stored in the liver) that has been converted, from excess glucose in the blood, by insulin
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Insulin dosage for strenuous exercise...
Lower dose of insulin required as more glucose needs to be present in the blood
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Other cards in this set

Card 2

Front

Automatic control systems

Back

What keeps the level temperature, water and carbon dioxide steady?

Card 3

Front

They act when conditions change from the ideal or set point and returns conditions back to this set point

Back

Preview of the back of card 3

Card 4

Front

37 degrees celsuis

Back

Preview of the back of card 4

Card 5

Front

1) Heat stroke (pulse is rapid but weak) 2) Dehydration

Back

Preview of the back of card 5
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