Question

In which one of the following preparations are you likely to come across cell junctions most frequently?
A. Thrombocytes
B. Tendon
C. Hyaline cartilage
D. Ciliated epithelium

Answer 1

Hint: Cell junctions are a category of cell structures consisting of complexes of multiprotein that provide communication or adhesion in animals between adjacent cells or between a cell and in the extracellular matrix. They also establish the epithelial intercellular barrier and regulate intracellular transport.

Complete answer:
Platelets are also termed as thrombocytes and are cell fragments that circulate throughout the blood. Generally, in cases of injury, they are beneficial and bind to walls of damaged vessels or the site of a wound to release chemicals that coagulate and close the vessel or wound. Tendon is a tissue that connects a muscle to other parts of the body, usually the bones. Tendons are the connective tissues that distribute to the bones the mechanical force of muscular contractions; the tendon is tightly bound at one end to muscle fibers and the other end to parts of the bone.
Hyaline cartilage is a type of connective tissue found in organs such as the ears, nose, and trachea. Hyaline cartilage provides protection and flexibility to various parts of the body. Epithelial tissue is fabricated from a tightly fitting continuous layer of epithelial cells. Either the external atmosphere or body fluid is exposed to one surface of the epithelial tissue. The other surface, composed of fibers and polysaccharides secreted by epithelial cells, is bound to the tissue by a membrane. In between cells, there is little intercellular matter present. Specialized junctions between the epithelium cells are present, linking individual cells.

So, the correct answer is option (D).

Note:
Cell junctions can be classified into three basic types based on their function:
> Tight junctions-avoid leakage between tissues.
> Adhering to junctions-keep well cemented adjacent tissues together.
> Gap junctions-to make it easier for ions and molecules to travel through the tissue.