Transport through membranes

which homework questions would you like me to discuss?

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Slide 1: Open question

BiologieMiddelbare schoolhavoLeerjaar 4

This lesson contains 30 slides, with interactive quizzes, text slides and 4 videos.

Lesson duration is: 90 min

Items in this lesson

which homework questions would you like me to discuss?

Slide 1 - Open question

AIM

You can explain what diffusion and osmosis are and describe the role of osmosis in the rigidity of plants.
You can describe how the transport of substances occurs through (cell) membranes.

Slide 2 - Slide

Transport

Slide 3 - Slide

Cell membrane

Separates the inside from the outside of the cell

Controls what goes in and out of the cell

Slide 4 - Slide

Transport door membranen

Slide 5 - Slide

WHAT*

read in reader page 9-16 (H) page 16-21 (V)

WHAT**

make ex. transport through membranes

WHAT***

check answers

HOW

individual

in silence

NEED HELP

look at the text in reader
go on to the next excercise
AKS TEACHER raise your hand

get to work - IN SILENCE

Slide 6 - Slide

Slide 7 - Video

Slide 8 - Video

Slide 9 - Video

What is concentration?

Slide 10 - Mind map

Slide 11 - Slide

Concentration

In organisms, substances are dissolved in the cytoplasm of the cell.
Living organisms require substances to enter and exit each cell. For example oxygen and glucose.
Chemical reactions take place in cells that can change the concentrations of solutes.

Slide 12 - Slide

Diffusion

The movement of a substance from an area of high concentration to an area of low concentration of that substance.

Diffusionspeed depends on the temperature.

Slide 13 - Slide

Osmosis

= diffusion of water through a semipermeable membrane

= the movement of water from a place with a low solute concentration to a place with a high concentration

Slide 14 - Slide

Osmosis

Slide 15 - Slide

Slide 16 - Slide

Slide 17 - Slide

types of membranes

permeable =

a membrane with big pores, water and substances can move through the pores

semi-permeable or selectively permeable =

very small pores, only water can go through, not the dissolved substances

Slide 18 - Slide

Osmotic pressure

How much water moves is determined by the osmotic value on both sides of the membrane.

Osmotic value: amount of dissolved substances in the water.

High osmotic pressure: a lot of dissolved substances.

Low osmotic presurre: a few dissolved substances.

Water flows of a low > high osmotic value.

The solution with the highest osmotic pressure has a suction force on the water from the other solution. This suction force is called the osmotic pressure.

Slide 19 - Slide

Osmosis in animal cells

hypotone solution OUTSIDE of the cell

water goes in by osmosis and the cells burst

isotone solution OUTSIDE of the cell

no osmosis, no difference in osmotic pressure

hypertone solution OUTSIDE of the cell

water leaves the cell through osmosis, the cells shrink

Slide 20 - Slide

Slide 21 - Slide

osmosis in a plant cell

Slide 22 - Slide

Slide 23 - Slide

passief transport

kost geen energie

verloopt altijd door een concentratieverschil

osmose en diffusie

Slide 24 - Slide

Active transport, from low to high, costs energie = ATP.

gaat tegen de concentratiegradiënt in

kost wel energie

Slide 25 - Slide

exo/endocytose

Exocytose:afsnoeren blaasjes (actief)

Endocytose: opnemen stoffen

-> endosoom.

Voeding opnemen: fagocytose

Slide 26 - Slide

WHAT

beginner: read page 9-18 + make notes

intermediate: make exc. 1-9

HOW

individual

in silence

NEED HELP

look at the text page 9-18 in reader
go on to the next excercise
AKS TEACHER when passing your desk

get to work - IN SILENCE

timer

15:00

Slide 27 - Slide

What do you remember from this class?

Slide 28 - Open question

Do you need more explanation?

Slide 29 - Open question

Slide 30 - Video