Not to be confused with Retinal. Retinol, also known as Vitamin A1, is a vitamin found in food and used as a dietary supplement. As a supplement it is used to treat and prevent vitamin A deficiency, especially that which is resulting in xerophthalmia.
Desmosomes are anchoring junctions â mechanical couplings scattered like rivets along the sides of adjacent cells to prevent their separation. On the cytoplasmic face of each plasma membrane is a thickening called a plaque.
Communicating Junctions - Gap Junctions. 1  Junctions that provide direct connections between cells. 2  Allows passage of small molecules from cell to cell in a tissue. 3  Channels or pores through the membranes of two cells and across the intercellular space. 4  Form electrical synapses.