3- movement in and out of cells Flashcards Preview

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Flashcards in 3- movement in and out of cells Deck (12)
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1
Q

diffusion

A

The net movement of particles from higher to lower

concentration area down a concentration gradient.

2
Q

source of energy for diffusion

A

kinetic energy of random movement of molecules and ions

3
Q

examples of diffusion in plants

A

-carbon dioxide gas from the air into the leaf during
photosynthesis.
- oxygen released from the leaf through the stomata.
- water vapor out of the leaf as transpiration.

4
Q

examples if diffusion in animals

A
  • oxygen from lungs to blood.
  • carbon dioxide from cells to blood.
  • Products of digestion are absorbed from ileum of mammal
5
Q

factors affecting diffusion

A

temperature, concentration difference, diffusion distance, surface area

6
Q

osmosis

A

Diffusion of water molecules from high water potential
to low water potential area through partially permeable
membrane down concentration gradient

7
Q

example pf osmosis

A

movement of water in and out of cells

8
Q

isotonic conditions

A

water potentials are equal, no net movement

9
Q

hypotonic conditions

A

water potential outside cell is higher, so water enters the cell and it bursts or swells

10
Q

hypertonic conditions

A

water potentail inside cell is higher so water leaves the cell causing it to shrink and become flaccid

11
Q

active transport

A

Diffusion of water molecules from high water potential
to low water potential area through partially permeable
membrane.

12
Q

examples of active transport

A
  1. root hair cells take in nutrients & minerals from soil.
  2. glucose is actively transported from the lumen of the
    intestine into the villi cells.
  3. glucose is actively transported from kidney tubules into the blood.