A close up of an eye showing the capillaries. The definition of a capillary is a small blood vessel that is part of the network of the small arteries and small veins, or an extremely thin tube through which nothing thicker than a human hair can pass.
Phospholipid bilayer. Definition. noun. The two layers of phospholipids arranged in such a way that their hydrophobic tails are projecting inwards while their polar head groups are projecting on the outside surfaces. Supplement. This arrangement of phospholipids in bilayer is used to describe the cell membranes of many animal and plant cells. The two layers of phospholipids are arranged in a way that their hydrophobic tails are projecting to the interior whereas their hydrophilic heads are projecting the exterior.
Phospholipids are a class of lipids and are a major component of all cell membranes as they can form lipid bi-layers. Phospholipids are a type of large group of organic compounds called âLipidsâ.Lipids are a broad group of naturally occurring molecules with fats, waxes, fat-soluble vitamins (such as vitamins A, D, E and K), phospholipids and others.n water based solution, the phospholipids automatically arrange themselves into a double layer, or as a âphospholipid bi layerâ. The fatty acids, which repel water, are found in the middle of the bi layer.