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

diffusion

The net movement of particles from higher to lower
concentration area down a concentration gradient.

2

source of energy for diffusion

kinetic energy of random movement of molecules and ions

3

examples of diffusion in plants

-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

examples if diffusion in animals

-oxygen from lungs to blood.
-carbon dioxide from cells to blood.
-Products of digestion are absorbed from ileum of mammal

5

factors affecting diffusion

temperature, concentration difference, diffusion distance, surface area

6

osmosis

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

7

example pf osmosis

movement of water in and out of cells

8

isotonic conditions

water potentials are equal, no net movement

9

hypotonic conditions

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

10

hypertonic conditions

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

11

active transport

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

12

examples of active transport

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.