Revision Summary for Module B4

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  • Created by: dpm
  • Created on: 04-05-16 23:09
What is homeostatis?
Maintaining a constant internal enviroment
1 of 24
Name two things in your body that automatic control systems regulate
Inputs & outputs
2 of 24
How might mountain climbing affect you blood oxygen level?
Less oxygen available
3 of 24
Name the three main stages in negative feedback
Receptor, response and effectors
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What is the advantage of effectors that work antagonistically?
The effectors will carry on produced responses for as long as they're stimulated by the processing centre
5 of 24
Give the definition of diffusion
Gradual movement of particles from lots to few of them
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Give two examples of chemicals that can move into cells by diffusion
02 & C02
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What is osmosis?
Diffusion of water
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Why is it important for animal cells to regulate their water content?
Cells can rupture or shrivel up, dependent if too much water is moving in or out
9 of 24
Give the definition of an enzyme
Are proteins that speed up chemical reactions in cells
10 of 24
Describe the 'lock and key' model
Substrate fits into the enzyme just like a key fits into a lock
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What is a denatured enzyme?
Protein is altered
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What is the average human core body temperature?
37 c
13 of 24
Name the area of the brain that detects the temperatature of the blood
Hypothalamus
14 of 24
Name two respoces the body has to high body temperature
Too hot = More sweat/vasodilation Too cold = Shiver/Vasoconstriction
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What is vasoconstriction?
When your body gets too cold, blood vessels close to the skin's surface get small in diameter
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Give an example of an effectors involvled in increasing body temperature
Sweat glands
17 of 24
Name two symptoms of heat stroke
Possible answers: Headaches, dizziness, nausea, vomiting, loss of appetite, confusion, disorientation and visual hallucinations
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What is hypothermia?
When your body temperature falls below 35 c
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Give two ways water is gained by the body
Drinks, food or respiration
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What factors can affect the concentration of urine produced by the kidneys?
Concerntration of the blood plasma
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What organ released ADH?
Pituitary gland
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If there is an increase in water content will more or less ADH be released?
Less
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What effect does alcohol have on urine production?
Larger amount of more dilute urine
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Other cards in this set

Card 2

Front

Name two things in your body that automatic control systems regulate

Back

Inputs & outputs

Card 3

Front

How might mountain climbing affect you blood oxygen level?

Back

Preview of the front of card 3

Card 4

Front

Name the three main stages in negative feedback

Back

Preview of the front of card 4

Card 5

Front

What is the advantage of effectors that work antagonistically?

Back

Preview of the front of card 5
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