Wednesday, June 10, 2009

Lesson 18: Specialised cells

Hi,
More colourful slides for your learning experience.
The 12 slides are very useful in learning the following concepts:
  • shape and size of specialised cells are related to their adaptation for their functions
  • guard cell, unevenly thickened wall, to open and close the stoma
  • long finger-like shape to increase surface area to volume ratio in root hair cell
  • hollow cell with thick lignified walls in xylem to conduct water upwards
  • ciliated lining cell in trachea to waft dust and germs upwards the air passages
  • long tail and plenty of mitochondria in sperm cell to swim
  • plenty of yolk and large in egg to store nutrients for growth
  • ability to move about in tissue fluid and ingest bacteria in phagocyte
  • ability to contract and relax thus change length in muscle cell
  • biconcave disc shape with haemoglobin in red blood cell to absorb and transport oxygen
  • long, myelinated axon in nerve cell to transmit nerve impulses over long distances
  • cell, tissues, organs, systems, organism-order of complexity




Cheers

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