Biology - Diffusion

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One way molecules can move in and out the cell is from ___
Diffusion!
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Define diffusion (think of a can of deodorant and how it spreads)
The spreading out of particles from high to low concentration.
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Diffusion is a ___ (overall) movement
Net
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Name three molecules that move in/out cell by diffusion
Oxygen. Carbon Dioxide. Urea
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So, cells need oxygen for __ (carried out by mitochondria)
Respirtaion
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Cells are surrounded by a ___ concentration of oxygen
High
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Why is this?
Oxygen is transported into bloodstream by lungs.
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Why does oxygen move into the cell by diffusion? (high-low)
High - low concentration. Higher conc in bloodstream, around the cell, and lower in the cell.
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The oxygen will move into the cell, becoming a higher concentration then outside, meaning it will then move...
Out of the cell
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Another molecule that moves by diffusion is Urea. What is urea?
A waste product produced inside cells
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It diffuses __ of cells, and __ the blood plasma (yellowish liquid that holds blood cells), and is exerted by the ___
Out of cells. Into blood plasma. Exerted by kidneys.
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The concentration gradient can effect the rate of diffusion. What is it?
The difference in concentration
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The ___ the conc. gradient the ___ the rate of diffusion.
Greater conc. gradient, faster rate. OR Lower conc. gradient slower rate
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The rate can also be effected by temp. why?
High temp, more kinetic energy, faster movement
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The larger the surface area of the membrane, the ___ rate of diffusion.
Greater
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Other cards in this set

Card 2

Front

Define diffusion (think of a can of deodorant and how it spreads)

Back

The spreading out of particles from high to low concentration.

Card 3

Front

Diffusion is a ___ (overall) movement

Back

Preview of the front of card 3

Card 4

Front

Name three molecules that move in/out cell by diffusion

Back

Preview of the front of card 4

Card 5

Front

So, cells need oxygen for __ (carried out by mitochondria)

Back

Preview of the front of card 5
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