KateJohnson2002
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I got a question wrong on my biology test. It's a two marker.

Breathing allows large amounts of oxygen to enter the blood. Explain how breathing does this.

Does anyone know what two points I should have included?
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username4725454
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(Original post by KateJohnson2002)
I got a question wrong on my biology test. It's a two marker.

Breathing allows large amounts of oxygen to enter the blood. Explain how breathing does this.

Does anyone know what two points I should have included?
Are you studying AQA Biology A level?

My answers would be:
- Breathing maintains a concentration gradient of oxygen (from the atmosphere to the lungs) through the process of inspiration.
- Oxygen reaches the lungs passing through the trachea, bronchi, bronchioles and alveoli where gas exchange (CO2 and O2) take place.
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KateJohnson2002
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No, I'm doing my GCSE's but thanks anyway
(Original post by Jacob Billyeald)
Are you studying AQA Biology A level?

My answers would be:
- Breathing maintains a concentration gradient of oxygen (from the atmosphere to the lungs) through the process of inspiration.
- Oxygen reaches the lungs passing through the trachea, bronchi, bronchioles and alveoli where gas exchange (CO2 and O2) take place.
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Jpw1097
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(Original post by KateJohnson2002)
I got a question wrong on my biology test. It's a two marker.

Breathing allows large amounts of oxygen to enter the blood. Explain how breathing does this.

Does anyone know what two points I should have included?
The question emphasises 'large amounts of oxygen' - you could also talk about how there are lots of alveoli and this provides a very large surface area. In addition, the blood-gas barrier is very thin - it is composed of a single layer of squamous (flattened) epithelial cells, the basement membrane and the capillary endothelium (again, a simple squamous epithelium). Both these factors increase the rate of diffusion.
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