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Cell-Cell Junctions and Adhesion
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Cell-Cell Junctions and Adhesion

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Questions and Answers

What is the purpose of direct cell-cell junctions?

Creates pathways for communications, allows cells to exchange signals that coordinate their behavior, and regulates patterns of gene expression

What is the extracellular matrix composed of?

Extracellular materials that cells secrete

What are the four functional classes of cell junctions in animal tissues?

Includes cell-cell junctions and cell-matrix adhesions, transmits stresses and is tethered to cytoskeletal filaments, seals the gap between cells, and creates passageways linking the cytoplasm of adjacent cells

What is the function of anchoring junctions?

<p>Transmit stresses and are tethered to cytoskeletal filaments inside the cell</p> Signup and view all the answers

What is the role of tight junctions?

<p>Seal the gap between cells in the epithelia to make the cell sheet into an impermeable (selectively permeable) barrier</p> Signup and view all the answers

What is the function of gap junctions?

<p>Create passageways linking the cytoplasm of adjacent cells and allow signals to be relayed from cell to cell across their plasma membranes</p> Signup and view all the answers

What is an example of gap junction function in the nervous system?

<p>Chemical synapsis, where signals are relayed from one neuron to another</p> Signup and view all the answers

What is the role of adherens junctions?

<p>Tether cells to each other and to the extracellular matrix</p> Signup and view all the answers

What is the purpose of summarizing the various types of cell junctions?

<p>To understand their functional classification and roles in animal tissues</p> Signup and view all the answers

Study Notes

Cell-Cell Adhesion and Junctions

  • Cells cling to each other through two main ways: direct cell-cell junctions and extracellular matrix
  • Direct cell-cell junctions:
    • Create pathways for communication between cells
    • Allow cells to exchange signals that coordinate their behavior
    • Regulate patterns of gene expression
  • Extracellular matrix:
    • Composed of extracellular materials secreted by cells
    • Controls the orientation of cells' internal structure

Functional Classes of Cell Junctions

  • There are four functional classes of cell junctions in animal tissues
  • These classes include both cell-cell junctions and cell-matrix adhesions
  • Functions of these classes:
    • Transmit stresses and are tethered to cytoskeletal filaments inside the cell
    • Seal the gap between cells in the epithelia to create an impermeable barrier
    • Create passageways linking the cytoplasm of adjacent cells
    • Allow signals to be relayed from cell to cell across their plasma membranes

Specific Types of Cell Junctions

  • Examples of cell junctions:
    • Chemical synapses in the nervous system
    • Immunological synapses, where T-lymphocytes interact with antigen-presenting cells
  • Epithelial cells have specific types of cell junctions that play a crucial role in forming a barrier

Classification of Cell Junctions

  • Cell junctions can be functionally classified into different types, as shown in Table 19-1
  • This classification is important for understanding the roles of cell junctions in different tissues and cells.

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Description

This quiz covers the different ways cells adhere to each other, including direct cell-cell junctions and extracellular matrix. It also explores the functional classes of cell junctions in animal tissues.

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