4.1.3 Transport in Cells - Diffusion

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What is diffusion?
Spreading out of particles in a net movement from an area of high concentration to an area of low concentration
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Substances may move in and out of cells across cell membranes via ____
Diffusion
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Net movement = ?
Net movement = particles moving in - particles moving out
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What affects the rate of diffusion?
The difference in concentrations, the temperature, and available surface area
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The difference between 2 areas of concentration is called the _____
Concentration gradient
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Diffusion occurs _____ a concentration gradient
Down
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How does oxygen move by diffusion?
Oxygen passes from air in lungs into red blood cells through cell membranes through diffusion. Oxygen moves down a concentration gradient from area of high concentration to area of low concentration. Then oxygen moves from blood cells to the body
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How does carbon dioxide move by diffusion?
CO2 moves out from the body cells into red blood cells and the into the air in the lungs via diffusion down a concentration gradient.
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What is gas exchange?
The diffusion of O2 and CO2 in opposite directions in the lungs
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How may individual cells be adapted to make diffusion easier and faster?
Increasing S.A. of cell membrane. By folding the membrane of the cell or tissue lining, the area over which diffusion can take place is greatly increased therefore rate of diffusion is also greatly increased
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Other cards in this set

Card 2

Front

Substances may move in and out of cells across cell membranes via ____

Back

Diffusion

Card 3

Front

Net movement = ?

Back

Preview of the front of card 3

Card 4

Front

What affects the rate of diffusion?

Back

Preview of the front of card 4

Card 5

Front

The difference between 2 areas of concentration is called the _____

Back

Preview of the front of card 5
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