Biology Lecture 17 - Biology Lecture 17 Intercellular...

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Biology Lecture 17 Intercellular Junctions: Plasmodesmata are plasma membrane lined channels between plant cells Water and small solutes can pass through them Tight junctions are found between epithelial cells Prevent leakage of extracellular fluid Desmosomes weld the cells together to strengthen their connection Made of intermediate filaments and help like the cytoskeletons of the joining cells Gap junctions (communication junctions) provide cytoplasmic channels between adjacent cells Allows cells to work together and substances pass through them Cells are always in communication and they communicate by chemical signals Communication by cells that are close to each other Direct contact (cell junctions/cell-cell recognition) Local signaling i.Paracrine signaling is when a single cell can release a signal to multiple cells in its surroundings ii. Synaptic signaling includes never cells Communication by cells that are far apart from each other Plants and animals use chemicals called hormones
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This note was uploaded on 05/03/2011 for the course BIO 311 C taught by Professor Mcclelland during the Fall '09 term at University of Texas at Austin.

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Biology Lecture 17 - Biology Lecture 17 Intercellular...

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