Involuntary weight loss exceeding 10 pounds or 5% of body weight over a period of a few months is cause for concern. Tests are done based on the person's symptoms and findings on physical examination.
Fluid Mosaic Model. A model of membrane structure; according to this model, membranes are composed of a double layer of phospholipids in which various proteins are embedded. The phospholipid bilayer is a somewhat fluid matrix that allows the movement of proteins within it.hospholipid Bilayer. A double layer of phospholipids that forms the basis of all cellular membranes. The phospholipids heads, which are hydrophilic, face the water of extracellular fluid or the cytoplasm; the tails, which are hydrophobic, are buried in the middle of the bilayer.
Answers. Best Answer: The phospholipid bilayer is a membrane consisting of two layers of phospholipids. Because the phospholipids possess a head and a tail, they can be arranged so that each layer has the heads facing outward with the tails facing the other layer. ()()()()()()()()()() ||||||||||||||||||||||||||| ||||||||||||||||||||||||||| ()()()()()()()()()() If you use your imagination, the diagram above will serve. The bilayer acts as the wall of a cell in mammals, keeping bad stuff out and good stuff in.