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Science - Specialised cells (Water Potential (Measure of how much water…
Science - Specialised cells
Turgor
Excess water in cell
Hard
Pushes membrane against cell wall
Rigidity of the cell
Water Potential
Measure of how much water molcules move in solution
How freely water moleacules move
Relative tendency of water to move from one area to another
Represented by
Root hair cell
Large surface area
Vacole contains cell sap with low water potential
Found at plants roots near growing tips
Maximise movemet of water and minerals into plant root
Active Transport
Sperm cell
Males gametes
Tail like structure called undulipodium -> allows movement
Head is made up of acrosome
Acrosoem contaims digestive enzymnes
Reased when sper meets egg and penetrates egg
Sizes
Mid piece of tail is 7 micro meters
End tail is 40 micrometers
Head is 3 micrometers wide and 4 micrometers long
Delivers genetic information (fertilisation)
Egg cell
Alsocalled ova
One of the largest cells in the human body
0.12mm in diameter
Haploid nucleus contains genetic information
Zona Pellucida is outer protectective layer of cell
Attached Zona Pellucida is Coronoa Radiata
Supplies proteins needed for fertilisation
Palisade Mesophyll Cell
Tal and closely packed
Absorb maximum light
Contains lots and lots of Chloroplasts
Most photosynthesis takes place here
Support structure
Turgor
Red Blood cell
Erythrocytes
Biconcave shape
Increases surface are
Flexible
Squeeze through narrow blood capillaries
No nucleus or other organelles in mammals
Increases space for hameoglobin
Hameogloban carriers oxygen
White Blood cell
Netrophils
Important role in immune system
Multi-lobbed nucleus
squeeze through small gaps when traveling to site of infection
allows engulfing of bacteria/virus
Granulated cytoplasm
