Question

dandruff is the excess flaking off of the superficial layer of the scalp. why is dandruff in patches or sheets of cells rather than individual cells flaking off?
answer

• due to the presence of gap junction
• due to the presence of tight junction
• due to the presence of desmosomes
• due to the presence of hemidesmosomes
• i dont know yet

Explanation:

Desmosomes are cell - cell adhesion structures that hold adjacent epithelial cells together strongly. In the scalp's epithelial tissue, the cells are connected by desmosomes. When the superficial layer cells flake off (as in dandruff), because the cells are held together by desmosomes, they come off in patches or sheets rather than as individual cells. Gap junctions are for intercellular communication, tight junctions are for sealing spaces between cells, and hemidesmosomes attach cells to the extracellular matrix. So the presence of desmosomes explains why dandruff is in patches/sheets.

Answer:

Due to the presence of desmosomes (the option with "Due to the presence of desmosomes")