Lecture 22 Cell junctions

Lecture 22 Cell junctions - Biol141 Foundations in Modern...

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Biol141 Foundations in Modern Biology Cellular Biology and Genetics Lecture 21 – Wednesday, October 19 th , 2011 Cell-cell interactions. Reading: Freeman, Emory 2 nd Ed. Chapter 8.1- 8.2
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Learning objectives At the end of this lecture, you will be able to: 1) Describe the outer surfaces of plant and animal cells, including cell wall and extracellular matrix structure. 2) Explain the structures connecting neighboring cells, for example, the tight junctions and desmosomes that connect epithelial cells. 3) Describe the communication the cells via cell-cell gaps, including use of plasmodesmata and gap junctions.
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1. Most cells possess a protective layer or wall that forms just beyond the membrane. ! This layer generally consists of a l fiber composite z – a cross-linked network of long filaments surrounded by a stiff “ground substance.”
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When new plant cells form, they secrete a fiber composite called a primary cell wall . The network is filled with hydrophilic gelatinous polysaccharides such as pectin , which keep the cell wall moist. This wall is composed of long strands of cellulose bundled into microfibrils that form a crisscrossed network.
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secondary cell wall inside the primary cell wall. Secondary cell wall structure correlates with the specific cells function. In cells that form wood, the secondary cell wall contains
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This note was uploaded on 04/02/2012 for the course BIO 141 taught by Professor Dr.cafferty during the Fall '11 term at Emory.

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Lecture 22 Cell junctions - Biol141 Foundations in Modern...

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