B5

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Describe what happens to pressure and volume in lungs when you breathe in and out?
Breathe in; Increase volume and decrease pressure Breathe out; Decrease volume and increase pressure.
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How are the alveoli adapted for efficient gas exchange?
Large surface area- increase area of diffusion, Moist surface- helps dissolve O and CO2, Permeable surface- things can move through it, Thin lining- one cell thick, Good blood supply.
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Describe the exchange of gasses at the body cells.
Gasses diffuses from high to low concentration so O diffuses out of the blood and into the cells and CO2 diffuses out of the cells and into the blood.
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How does the body detect the level of CO2 in the blood and how does it respond?
If it increases the brain causes the breathing rate to increase.
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Explain why only fish gills work in water.
The water helps support the gills and keep them separated.
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Explain how cilia and mucus protect the lungs.
The prevent dust from reaching the lungs and the cilia push mucus out of the lungs.
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Four main causes of lung disease.
Industrial materials eg. Asbestos, Genetic causes eg. cystic fibrosis, Lifestyle eg. smoking, Asthma.
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Two functions of physical digestion.
Chewing in the mouth, churning in the stomach.
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Types of digestive enzymes and what they breakdown.
Protease-amino acid-protein, Lipase-fatty acids and glycerol, Carbohydrase-glucose.
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Describe how stomach pH aids digestion.
Optimum pH for protease.
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Three ways that villi are adapted to aid digestion.
Micro villi for a bigger surface area, Single permeable layer, Good blood supply.
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In the kidneys, where does filtration happen and how?
In the glomerulus, above the nephron. Blood flows at high pressure, substances such as blood and urea are squeezed into the capsule.
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Other cards in this set

Card 2

Front

How are the alveoli adapted for efficient gas exchange?

Back

Large surface area- increase area of diffusion, Moist surface- helps dissolve O and CO2, Permeable surface- things can move through it, Thin lining- one cell thick, Good blood supply.

Card 3

Front

Describe the exchange of gasses at the body cells.

Back

Preview of the front of card 3

Card 4

Front

How does the body detect the level of CO2 in the blood and how does it respond?

Back

Preview of the front of card 4

Card 5

Front

Explain why only fish gills work in water.

Back

Preview of the front of card 5
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