B2.1.2 Flashcards

1
Q

How do dissolved substances move in and out of cells?

A

Through the cell membrane by diffusion.

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2
Q

What is the definition of diffusion?

A

The movement of particles from area of high concentration to an area of low concentration through the semi-permeable membrane.

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3
Q

What two factors will affect the rate of diffusion?

A

1) Temperature

2) Concentration

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4
Q

What is a concentration gradient?

A

A difference in concentration between two areas next to each other.

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5
Q

Name two locations in the body where diffusion is important?

A

Lungs and small intestines

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6
Q

Which important gas passes through the cell membrane and into cells?

A

Oxygen

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