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Bella Nat 5 Biology

Bella Nat 5 Unit 1 KA 2 Movement through membranes

QuestionAnswer
What is Diffusion The movement of molecules of a substance FROM their area of HIGH concentration TO their area of LOW concentration until they are evenly spread.
What happens to the rate of diffusion when there is a steeper concentration gradient It is faster
Name 2 substances that diffuse INTO cells in the tissues Oxygen, Glucose, Amino Acids, Water
Name 2 substances that can diffuse out of cells in the tissues Carbon dioxide, Urea Water
What do you call the holes found in cell membranes Pores (or channels)
What size must molecules be to be able to diffuse into and out of cells Small
What is the name we give to a membrane that chooses what can pass through it? Selectively permeable
What are the names of the 2 different types of molecule which make up the cell membrane Phospho-lipid molecules, Protein molecules
Is diffusion Active or Passive Passive
What does Passive mean Does not require Energy
What is Osmosis The name for the diffusion of water
Define Osmosis Osmosis is the movement of WATER molecules from their area of high water concentration to their area of low water concentration THROUGH A SELECTIVELY PERMEABLE MEMBRANE.
Where does Oxygen diffuse INTO the blood Lungs
Where does Oxygen diffuse OUT of the blood Tissues
Is Osmosis Active or Passive Passive
Define Active transport The movement of molecules AGAINST their concentration gradient from an area of LOW concentration to an area of HIGH concentration.
Does Active Transport require energy? Yes
Give an example of a substance that is pumped OUT of cells by active transport Sodium ions
Give an example of a substance that is pumped OUT of cells by active transport Potassium ions
What is a Hypotonic solution? One that has a LOW conc. of SOLUTE (high conc. of water)
What is a Hypertonic solution? One that has a HIGH conc. of SOLUTE (low conc. of water)
What is a Isotonic solution? SAME conc. as other solution
What happens to ALL cells when placed in a Hypotonic solution? They GAIN mass by osmosis.
What happens to ALL cells when placed in a Hypertonic solution? They gain LOSE mass by osmosis.
What happens to ALL cells when placed in a Isootonic solution? Nothing
What eventually happens to animal cells in Hypotonic solutions? BURST
What eventually happens to animal cells in Hypertonic solutions? SHRIVEL
What eventually happens to PLANT cells in Hypotonic solutions? They swell up and become TURGID
What eventually happens to PLANT cells in Hypertonic solutions? They shrivel and become PLASMOLYSED
Created by: nscobie