Transcript of Extracellular components and junctions. Plant cells Plasmodesmata the intracellular junction between...
- Slide 1
- Extracellular components and junctions
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- Plant cells Plasmodesmata the intracellular junction between
plant cells water and small solute can pass freely from cell to
cell Cell walls Primary cell wall(found in young plants; thin and
flexible) Middle lamella(thin layer rich in pectin or sticky
polysaccharides) Secondary cell wall(a strong durable matrix that
affords cell protection and support)
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- Animal Cell Junctions Glycocalyx strengthens cell surface and
helps stick animal cells together Tight junctions Prevent leakage
of extracellular fluid by binding the plasma membrane of
neighboring cells together Desmosomes Fasten cells together but
allows fluids to be transported Gap junctions Provide cytoplasmic
channels from one cell to another
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- Extracellular components in animals Extracellular Matrix (ECM)
The substance in which animal cells are embedded Main ingredients
are glycoproteins or short chains of sugar Collagen is the most
common glycoprotein
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- Interactions Cell wall uses pectin to glue itself to adjacent
cells. Plasmodesmata provides a channel to transport water and
solvents to neighbor cells. The ability of this macrophage(blue) to
recognize and destroy bacteria(yellow) is an activity of the whole
cell. Its cytoplasm, lysosomes, and plasma membrane are the
components functioning in this picture.
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- http://www.youtube.com/watch?v=uXBOb4Zy5Sg&feature
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