KIN 2500 Chapter : Chapter 2 SI
Document Summary
All of the cellular contents between the plasma membrane and the nucleus. Regulated the flow of materials into and out of a cell; allows communication between cells and their external environment. Organelles-found in the cytosol and each have a different function. Chromosomes found within the nucleus contain genes that control cellular structure and function. Extracellular fluid (ecf: interstitial fluid, plasma, lymph. Between tissue cells, in blood vessels, lymphatic vessel. Active: cellular energy is used to drive a substance uphill against its concentration or electrical gradient. Passive: substance moves down its concentration gradient or electrical gradient to cross the membrane using its own kinetic energy. Passive process: osmosis: involves the movement of water molecules from an area of high concentration to low concentration until equilibrium is reached. Passive process: transport by transporter proteins, facilitated diffusion: movement of a substance down its concentration gradient via transmembrane proteins that act as transporters.