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.
Adhesive junctions - holds cells together acting as buttons or zippers to maintain cells in fixed positions in tissues; example: desmosome; hemidesmosome anchors cells to extracellular matrix. 2. Tight junctions - close the spaces between cells to diffusion forming a dam that prevents the flow of ions, etc.