Cell Membrane

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Cell Membrane
How did it get there?
Gas Exchange
Getting in
Misc Cell
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Number of layers of the cell membrane
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Two
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What are the layers of the cell membrane made of?
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Phosolipids and Proteins
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The structures of the cell membranethat act as
antennae to receive chemical messages
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Glycoproteins and glycolipids
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The nonpolar tails of phospholipids tend to repel
? and let ? Molecules pass through.
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Ions and fat soluble
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Explain the structures of this diagram
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(No Transcript)
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Water moving from a high to low concentration
through a selectively permeable membrane.
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osmosis
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What is diffusion?
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Movement of molecules from a high to low
concentration.
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What happens to the molecules when a cell reaches
equilibrium?
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Concentrations are equal, but movement still
occurs.
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What is facilitated diffusion?
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Diffusion (high to low concentrations) through
protein channels to allow large molecules through.
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Two ways that facilitated diffusion and active
transport are different.
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Low to high concentration, active requires energy.
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What are channels made of?
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protein
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What would happen if a cell was impermeable?
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die
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An animal cell surrounded by fresh water the
turgor pressure can increase to the point the the
cell will..
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burst
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If a cell s internal salt concentration is 5
What would happen to the cell if it was placed in
water with .02 salt solution
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Water will diffusion into the cell.
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If a cell were treated with a chemical that
inhibits active transport what would happen to
the cell?
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Cell would die
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Which has a high O2 Concentration water or air
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air
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The primary concern of land gas exchange is..
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Drying out of the surfaces
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The structure in the lungs of mammals that
exchanges gases with the capillaries____
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aveoli
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The total surface area of all the alveoli in the
average persons lungs?

• 2 meters
• 12 meters
• 60 meters
• 600 meters

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60 meters
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Describe the path that air takes through the body.
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Nose, nasal cavity, trachea, pharynx, larynx,
bronchus, bronchioles, alveoli, capillaries,
blood through the body back to lungs and out.
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How do gases get in and out of plant cells?
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Stomates, surrounded by guard cells open and
close to allow gases in and out.
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Function of oils and waxes on human skin
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Prevent water loss
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Plant water loss
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Transpiration
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What are three functions of the nephrons?
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Filtration, secretion and reabsorption
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Three types of nitrogen wastes secreted by
animals.
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Ammonia-directly into water-fike fishUrea-
diluted in water-MammalsUric Acid-non-soluble,no
n toxic Birds and desert reptiles