YV4-Cells-Osmosis- Active Transport

• Biologie
• Middelbare school
• vwo
• Leerjaar 4

Cells & Osmosis

Osmosis

What does semi-permeable mean?

Describe what happens in the video

Diffusion

• Molecules move from a high to a low concentration
• The movement of molecules is random
• This is a form of passive transport, because the energy comes from the molecules themselves

How does heat affect diffusion?

What is the effect of distance on diffusion?

The shorter the distance, the faster the molecules will have equal concentrations throughout the space

What is the effect of surface area on diffusion?

The bigger the surface area, the faster the molecules will be evenly distributed over the available area

What is the effect of concentration gradient on diffusion?

The bigger the difference in concentration, the faster diffusion will happen

Misconceptions with diffusion

• Molecules want the concentration to be equal/ try to make the concentrations equal. Molecules have no mind to think with, they move randomly
• Molecules stop moving after the concentrations are equal. Molecules never stop moving, but when concentrations are equal there are equal amounts of molecules moving in every direction.

Questions

Which process is responsible for gas exchange in the lungs?

What have multi-celled organisms developed in order to provide an increased surface area for gas exchange?

Why do large multicellular organisms need transport systems while simple unicellular organisms do not?

Questions

What is homeostasis?

What is simple diffusion?

What is passive transport?

What is facilitated diffusion?

Facilitated diffusion needs what to get particles from one side of the membrane to the other?

Questions

What is homeostasis?

What is simple diffusion?

What is passive transport?

What is the difference between simple diffusion and facilitated diffusion?

Questions:

- A single plant cell is placed in an isotonic solution. Salt is then added to the solution. What would occur as a result of the salt addition? 

- What do plant cells have that animal cells do not have?

- Now a single plant cell is placed in a hypotonic solutions. What will happen to the plant cells a result of this?

- If a red blood cell and a plant cell were placed in seawater, what would happen to the two types of cells?

Questions:

What is active transport?

What is ATP?

What is endocytosis?

Give two examples of exocytosis?

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Questions:

What is active transport?

What is ATP?

What is endocytosis?

Give two examples of exocytosis?

Active transport

• The cell invests energy 
• Often against the concentration gradient 
• For example:

       -Pumps in the membrane
       -Endocytosis

02:58

Where will the water go?

04:53

What are the red blood cells compared to the hypothetical pure water IV?

04:53

Where is the higher solute concentration?

05:34

An animal cell placed in a hypertonic (salty) solution will?

Work to be done

Assessment questions Glencoe pg. 212-213: Q 33 - 42, 

46 and 47 

Biozone worksheet 62 and 75 

Make a concept list of 7.4