B3 checklist Flashcards

1
Q

What is the difference between diffusion and osmosis?

A

Osmosis is the movement of water from an area of high density to an area of low density across a partially permeable membrane.
Diffusion is the movement of particles from a low density to an area of high density

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2
Q

why should a distance runner have a isotopic drink rather than coke?

A

A runner should have a isotopic drink because it contains more glucose and will hydrate him faster than coke.

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3
Q

Why does active transport require energy?

A

Active transport requires energy because it is the movement of particles from a low density to a high destiny. Active transport moves against a concentration gradient and so needs energy to occur

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4
Q

What 2 adaptations does villi have which help the small intestine to work?

A
  1. Large surface area

2. Large supply of blood

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5
Q

Identify the main parts of the breathing system & describe how pressure changes occur?

A

Parts:
1. lungs
2. diaphragm
3 .Intercostal muscles

Pressure changes:
When we breathe in intercostal muscles and diaphragm contract, volume increases and pressure decreases.
when we breathe out intercostal muscles and diaphragm relax, volume decreases and pressure increases

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6
Q

Describe how the leaf is adapted for efficient exchange

A

Large surface area

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