B3: Respiration

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  • Created by: Callum
  • Created on: 26-04-14 12:31
Give 3 reasons why we respire.
To mantain a constant body temperature, to allow our muscles to contract and to build sugars
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What are the 7 key life process? (MRS GREN)
Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition
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Define aerobic respiration.
A process in which energy is released from glucose, using oxygen
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Give the word equation for aerobic respiration.
Glucose + Oxygen ----> Carbon Dioxide + Water
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Where does respiration take place?
In all living cells
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On which structure in the cell does respiration happen?
Mitochondria
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Where are these structures found within the cell?
In the cytoplasm
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Chemical reactions take place in the cytoplasm. What controls all chemical reactions?
Enzymes
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Explain why cells must regulate their temperature.
Otherwise, the enzymes would denature, respiration would stop happening and the cells would die
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What changes happen during exercise?
The heart rate increases and the rate and depth of breathing increases
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Why is this?
These changes increase the blood flow to the muscles and so increase the supply of sugar and oxygen to increase the rate carbon dioxide is removed
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What do the arteries do to help this happen quicker?
They dilate (widen) allowing more blood to pass through
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What is glucose stored as and why?
Its stored as glucogen so it can be converted back to glucose for use during exercise
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Why might aerobic respiration stop?
Oxygen may not get to the cells quickly enough and energy is still needed so the muscles will stop contracting as efficiently
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Define annaerobic respiration.
A process in which energy is released from glucose, without oxygen
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Give the word equation for anaerobic respiration.
Glucose ---> Lactic acid + energy
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Why is anaerobic respiration not as useful to cells as aerobic respiration?
1. Lactic acid is made (which causes muscle fatigue) and is released into the body 2. Less energy is released as the breakdown of glucose is incomplete 3. An oxygen debt is built up
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What will lactic acid do to the muscles?
It will build up making the muscles tired which will stop them contracting efficiently
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How is lactic acid removed from cells after exercise?
It is oxidised (repay the oxygen debt) into carbon dioxide and water
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Explain why athletes are keen to have as many red blood cells in the body as possible.
Red blood cells transport oxygen so having more will allow them to transport oxygen quicker and for longer
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Other cards in this set

Card 2

Front

What are the 7 key life process? (MRS GREN)

Back

Movement, Respiration, Sensitivity, Growth, Reproduction, Excretion and Nutrition

Card 3

Front

Define aerobic respiration.

Back

Preview of the front of card 3

Card 4

Front

Give the word equation for aerobic respiration.

Back

Preview of the front of card 4

Card 5

Front

Where does respiration take place?

Back

Preview of the front of card 5
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