Transport across cell membranes

Question 1

What are two vital roles that the cell membrane preforms?

Answer 1

• protect cell contents from environments

- control entry and exit of substances

Question 2

What does the cell membrane allow to get through?

Answer 2

• it allows glucose to get into the cell

- gets rid of waste products

Question 3

Substances can move across the cell membrane by two different processes :

Answer 3

• diffusion

- osmosis

Question 4

What is diffusion

Answer 4

• the spread of particles from an area of high concentration to an area of low concentration

Question 5

what does diffusion do in biology

Answer 5

• small molecules can move across a cell membrane by diffusion

Question 6

what does diffusion do in physics

Answer 6

• diffusion refers to the reflection or refraction or radiation, such as light or sound, by an irregular surface, tending to scatter in many directions

Question 7

What is osmosis

Answer 7

• Osmosis is the diffusion of water from dilute solution to a concentrated solution through a partially permeable membrane.