Life Processes

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Slide 17

Cilia Cell

4) The cilia cell - designed to stop lung damage Cilia cells line all the air passages in your lungs They have tiny hairs, which filter the air as it blows through The hairs sweep mucus (snot) with trapped dust and bacteria up to the back of the throat where it is swallowed

Slide 18

Egg Cell

2) The ovum (egg) cell - designed to be fertilised An ovum is large and bulky because no active movement is needed - it just sits and waits for the sperm to find it It contains yolk (in the cytoplasm) which provides a large food store needed for the developing young organism once it's fertilised It contains half the number of chromosomes, which carry genetic information from the mother - this will be passed on to the offspring

Slide 19

The root hair Cell

5) The root hair cell - designed for absorbing The long hair cell increases the surface area of the root, which helps absorption of water and minerals It has a really thin cell wall, which makes it easier for minerals to pass across into the root itself

Slide 20

Red Blood Cells

Doughnut shape to allow maximum O2 absorbed by the haemoglobin they contain. The function is similar the the Palisade Cells . They are doughnut shaped rather than tall to allow smooth passage through the capillaries

They are so packed with Haemoglobin that they have no room for a Nucleus

Slide 21

White Blood Cells

Are specialised because they help protect us against disease. They do this in two ways:

By engulfing the bacteria

By producing Antibodies, which recognise a particular type of illness the first time you have it, so when it appears again, you will not become ill.

This does not, however, work with viruses.

Slide 22

Homework

Explain how the Red Blood Cell [or a cell of your choice] is adapted to the job it carries out. In order to gain full marks, you should express your ideas using the correct scientific works and use good English

(3 marks))