5/28/2020Cells Lab: BIO210A-Y3 Anatomy and Physiology I 0520S(7.5W)1/20Cells LabCells LabDr. Bruce ForcieaCells are a major part of our bodies. In this section, we will review the major parts of a cell andinvestigate cellular transport mechanisms.The human body has something on the order of 10 trillion cells all working in harmony to keep usalive. Cells are fundamental building blocks for many of the tissues and organs of our bodies.In this section we will primarily be concerned with studying cells that contain a nucleus known aseukaryotic cells.The lowest level of organization is the atom followed by molecules and tissues and larger organellesand cells. The organelles of the cell are much like the organs in our bodies. Each organelle has aspecific function that is important in maintaining the cell.Visit the Virtual Cell page and learn about the organelles of the cell:Virtual Cell Website()The Cell MembraneThe structure of the cell membrane has a lot to do with its function. The cell membrane is composedof molecules called phospholipids.
5/28/2020Cells Lab: BIO210A-Y3 Anatomy and Physiology I 0520S(7.5W)2/20()()()The phosphate head of the phospholipidlikes water, so it is called hydrophilic while the lipid tail is called hydrophopic or “water hating.”Because of the water loving and hating characteristics of the heads and tails, phospholipids arrangethemselves in what is known as a bilayer.()
5/28/2020Cells Lab: BIO210A-Y3 Anatomy and Physiology I 0520S(7.5W)3/20The cell membrane also lets certain substances in or out. We say that it is selectively permeable. Forexample, lipid soluble substances can pass right through the cell membrane. Examples of lipidsoluble substances include oxygen, carbon dioxide and steroids.Water soluble substances cannot pass through the cell membrane and require carrier proteins inorder to get in or out of the cell. The cell membrane also contains a number of proteins. Some ofthese proteins are embedded on the surface of the cell and some go all the way through the cellmembrane. Some proteins act as channels to allow substances to pass through the membrane.