diffusion osmosis and active transportation

Question 1

What is osmosis

Answer 1

Osmosis is the net movement of water molecules across a partially permeable membranes from a region of higher water conc to a region of lower water conc

Question 2

How can the speed of diffusion be increased?

Answer 2

Increasing the concentration - particals will diffuse into the lower concentration area.
Increasing the temperature - the higher the temperature the greater the energy so the particals will move around quicker and diffuse faster

Question 3

Give a practical example of diffusion.

Answer 3

Oxygen diffuses from a high concentration in a red blood cell to a lower concentration in a tissue cell.

Question 4

What is osmosis?

Answer 4

The movement of water from a dilute solution to a concentrated solution through a partially permeable membrane.
It is a type of diffusion

Question 5

What is a partially permeable membrane?

Answer 5

A membrane that lets through small molecules such as water, but not larger molecules like glucose.

Question 6

What is active transport?

Answer 6

Active transport moves substances in and out of cells against the concentration gradient using energy released during respiration.
Lower concentration –> higher concentration

Question 7

Give an example of when active transport is used.

Answer 7

When there are nutrients in the gut but in too low concentration to diffuse into the blood. Active transport uses energy from respiration to allow nutrients to be taken into the blood.