4.1.3.1 diffusion

Question 1

What is diffusion

Answer 1

Spreading out of particles from an area of higher concentration to an area or lower concentration. This is randomly distributed.

Question 2

State facts about diffusion

Answer 2

-happens both in solids and gases
-can move through some cell membranes
-‘semi impermeable’ allowing certain substances to pass through, but not others.
-happens in the human body cells

Question 3

What is cellular diffusion

Answer 3

Oxygen and glucose travelling to cells - waste product is carbon dioxide.

Question 4

Explain the factors affecting diffusion.

Answer 4

-the larger the concentration (amount)
-temperature (affect on particles) this increases energy.
-surface area, more area for particles to pass through. I

Question 5

Explain gas exchange

Answer 5

Some of the substances transported in and out of cells by diffusion are oxygen and carbon dioxide.

Question 6

What is the waste product for gas exchange

Answer 6

Urea from cells into the blood plasma for excretion in the kidney

Question 7

A single called organism has a relatively large surface area to volume ratio. This allows sufficient transport of..

Answer 7

Molecules into and out of the cell to meet the needs of the organism.