BIOL 212 Lecture Notes - Lecture 2: Cell Adhesion Molecule, Hydrophile, Facilitated Diffusion
Document Summary
Everyone is made of around 75 trillion cells: there are over 200 different types of cells, cells are divided into sex cells (germ/gametes) or the sperm and egg. Somatic cells or the cells of the body: common theme of somatic cells is that the structure follows, inside cell membrane has the cytoplasm function. The fluid inside the cell is called the intracellular fluid. Provides a medium for nutrients, gases, and wastes: plasma is the extracellular fluid along blood cells, plasma membrane, the separation of environments. Surrounds every cells: separates cells contents from its surroundings. Fluid mosaic model: molecules of plasma membrane, this is the lipid bilayer embedded with proteins. There is a phosphate-glycerol head is polar (negative charged) and hydrophilic (likes water because water molecules are charged as the hydrogen particles are positively charged and the oxygen is negatively charged) The phosphate heads align towards the intracellular and extracellular fluid.
