Biology Essentials - Diffusion Flashcards

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1
Q

What is diffusion?

A

The spreading of particles from a high to low concentration

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2
Q

How is diffusion relevant in cells receiving oxygen?

A

High levels of oxygen in the blood stream diffuses into the cells

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3
Q

How is diffusion relevant in cells removing waste?

A

Waste carbon dioxide and uria in the cells, diffuses out into the low concentrated blood

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4
Q

What affects the rate of diffusion?

A

The concentration gradient
Temperature
surface area

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5
Q

How does the concentration gradient affect the rate of diffusion?

A

The greater the concentration gradient, the higher the difference in concentrations and the faster diffusion occurs

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6
Q

How does the temperature affect the rate of diffusion?

A

The higher the temperature the more kinetic energy the Particles have so move faster

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7
Q

How does the surface area affect the rate of diffusion?

A

A greater surface area means a faster rate of diffusion

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8
Q

What is facilitated diffusion?

A

Movement of substances from an area of high to low concentration with the help of a transport molecule

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9
Q

When is facilitated diffusion required?

A

Some large, electrically charged or lipid-insoluble molecules require assistance to diffuse across the plasma membrane

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