Chapter 3.4, Problem 17CC

(a)

Summary Introduction

To determine: The cell junction which stops the movement of particles between cells.

Introduction: Cell junctions are responsible for binds the cells to form tissues. These junctions can be formed between cells or between cell and matrix. Occluding junctions are one of the strong cell junctions present in tissues. These are also called tight junctions in vertebrates.

(b)

Summary Introduction

To determine: The cell junction which permits the direct movement of materials between the cytoplasm of neighboring cells.

Introduction: Cell junctions are formed between the cell or between the cell and extracellular matrix during the development period of a tissue. One of the strong cell junctions formed is communicating junction. This junction is responsible for interaction between cells and is termed as gap junctions in animals.

(c)

Summary Introduction

To determine: The cell junction which provides the strongest cell-cell adhesion.

Introduction: Anchoring junctions are the cell junctions which provide support to the tissue. These junctions create linkages between one cell and another cell or form cell-matrix adhesion. Cadherins are responsible for cell-cell adhesions whereas integrins are responsible for cell-matrix adhesions.

(d)

Summary Introduction

To determine: The cell junctions which connects actin fibers present in the cell to the extracellular matrix

Introduction: Cell junctions are formed during the development phase of a tissue. Anchoring junctions are one of the cell junctions formed in tissue. They provide mechanical strength to the tissue. These junctions connect one cell to another or cell with the extracellular matrix.