chapter 4 exchange with the environment cell energy the cell cycle
TRANSCRIPT
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Chapter 4
Exchange with the EnvironmentCell Energy
The Cell Cycle
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Essential question on cells:
This chapter answers the
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diffusion osmosis Active transport
endocytosis
exocytosis
Passivetransport
Fluency Chart
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Section 1
Exchange with the Environment
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Movement of “Tiny” particles:
Called Diffusion.
The movement of particles from high concentration to an area of low concentration. Happens in gases, liquids, and solids Ex. Of tiny particles: O2, H20, CO2
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Gases diffuse in other gases…
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Liquids diffuse into other liquids…
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Solids diffuse into other solids…
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Particles always move…
Brainpop
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It’s about the membrane silly!
•The membrane is made of phospholipid molecules. They have two parts to them. One is the two hydrophobic tails. The other is the hydrophilic head.
Diagram of a membrane:
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Plant and Animal Cell Rap
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A special diffusion of H20 across a
cell membrane
Water moves from high concentration to low concentration
OSMOSIS:
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Osmosis…
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Diagram of how osmosis works:Extreme osmosis:
Tap the cell
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A comparison……
diffusion osmosis
both
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Movement of “small ” particles:
Examples are sugars or amino acids These can’t pass through the
“phospholipid molecules” in the cell membrane
Need special protein channels to get in.
TWO types of movement:
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1) Passive transport
Particle diffuses through protein channels from an area of high concentration to an area of low concentration
Does not require any energy
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2) Active Transport
Movement of particles through proteins against the normal direction of diffusion.
(low to high concentration)
Requires the cell’s ATP (needs energy)
protein channel
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Diagram of active transport:
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Passive and Active Transport
Passive Active
Both
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CELL MEMBRANE:
Tap the pic.
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Moving Large Particles:
Two ways :
1) Bringing things in…Endocytosis 2) Getting things out of the cell…
Exocytosis video
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Animation of exocytosis:
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happens through
special type
depends on
happens w/o needing energy
requuires cell's ATP
depends on
moving big things in
moving big things out
Cell Exchange
Diffusion
Osmosis
particle Size-
small
passive transport
active transport
particle size- large
EndocytosisExocytosis
Concept map…