AS OCR Unit 1 Module 1 Specialised Cells

Specialised Cells

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  • Created on: 13-03-12 20:20
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Specialised Cells
1) Erythrocytes (red blood cells)
- It contains haemoglobin to carry more oxygen
(oxyhaemoglobin)
- No nucleus to increase surface area, so more
haemoglobin can be held
- It has a biconcave shape so it can easily pass
through blood vessels (increases surface area
volume ratio)
- No nucleus, ER, mitochondria so there is more space for haemoglobin
to carry oxygen
- High surface area volume ration so it is good for diffusion
- Flexible so it can move in and out of capillaries easily
2) Neutrophils ( type of white blood cell)
- It has a big nucleus to make enzymes and
proteins
- It contains a large number of lysosomes to
break down pathogens that enter
- Has microfilaments for endo and exocytosis
3) Sperm Cell
- It has a haploid nucleus
- Contains acrosomes to penetrate the egg
cell membrane
- Has a flagellum (otherwise known as
undulipodium) to help for movement
- Contains mitochondria for energy
4) Root Hair Cell
- Has a large root hair to increase surface area volume ratio
- It has increased surface area to absorb protein
- Cell wall to prevent bursting when turgid

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Vacuole that maintains water balance
- Contains a large number of mitochondria that carries out respiration for
the active uptake of minerals and energy
- Thin cell wall for short diffusion distance and takes up substances
quickly…read more

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