Cell Transport PDF

Cell transport is movement of different materials in and out of the cell. CELL MEMBRANE Down the concentrations gradient Against the concentrations gradient (High to low) (Low to high)  FACILITATED DIFFUSION · It is utilized by molecu...

Cell transport is movement of different materials in and out of the cell. CELL MEMBRANE Down the concentrations gradient Against the concentrations gradient (High to low) (Low to high)  FACILITATED DIFFUSION · It is utilized by molecules that are unable to freely cross the phospholipid bilayer via specific transmembrane integral proteins NO ATP is needed Transport proteins  DIFFUSION: Process by which substances spread through a liquid or gas from regions of higher concentration to regions of low concentration. Give examples of molecules that can move easily across the cell membrane? Oxygen and Carbon dioxide Osmosis - A special type of Diffusion Is the passage of water from a region of high water concentration, through a semi-permeable membrane, to a region of low water concentration. Cells can’t function without adequate water, most cellular Water Potential gradient process depends on osmosis. Tonicity-is the ability of a solution surrounding a cell to cause that cell to gain or lose water (Urry et al., 2017) Terms used only in relation to a pair of solutions isotonic solution: water concentration inside and outside the cell is equal/the same hypertonic solution: low water concentration Water will always move towards an outside the cell , water moves out of the cell. area where there is high solute hypotonic solution: high water concentration concentration outside of the cell, water moves into the cell.  Hypertonic Isotonic Hypotonic solution solution solution What is turgidity and why is it Turgidity is a state of being turgid or swollen. It’s important to cells because it maintains the firm important to plant cells? and erect position of the plant, especially herbaceous and nonwoody plants. ACTIVE TRANSPORT ·Requires the use of chemical energy to move substances across a membrane, against a concentration gradient. ATP  VESICLE TRANSPORT There are two types of vesicle transport, endocytosis and exocytosis. Both processes are active transport processes, requiring energy.  ENDOCYTOSIS AND EXOCYTOSIS Endocytosis is the process of capturing a substance or particle from outside the cell by engulfing it with the cell membrane.  Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell