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3rds Biology Revision

3rds-biology-revision

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Where are the lungs located?

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Explanation

The lungs are located in the thorax. They are protected by the ribcage.

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Order these in order of size, from smallest to largest.

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Trachea
Alveoli
Bronchioles
Bronchi

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What are alveoli?

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What is the trachea?

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Order these into the route of air travelling into the lungs, from first to last.

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Explanation

The route of air out of the lungs is the reverse of this.

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Nose/mouth
Bronchi
Bronchioles
Trachea
Larynx
Alveoli.
Trachea

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Breathing is caused by the

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muscles and the

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contracting and

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Put these in the right order for inhaling, from first to last.

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Volume of thorax increases, and pressure inside thorax decreases
Intercostal muscles contract, ribcage pulled up and out and diaphragm contracts and flattens
Air flows into lungs, inflating them

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Fill in the blanks.

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Inhaled air contains

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nitrogen,

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oxygen and

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carbon dioxide.

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Exhaled air contains

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nitrogen,

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oxygen and

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carbon dioxide.

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Gas exchange takes place where?

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