unicellular organism has contractile vacuoles which collect and pump the Excess water out of the organism (active transport). contractile vacuole contractile vacuole osmosis hypotonic Plant cells in different solutions: phagocytosis diffusion Exocytosis: this is the removal of substance from the cell and is basically the reverse of endocytosis. pinocytosis turgid/explodes Cell gains water and become turgid (stiff and hard). If water keeps entering by osmosis animal cells
Premium Cell Cell membrane Osmosis
Description Examples Passive processes Simple diffusion Kinetic energy Kinetic energy Net movement of particles (ions. molecules. etc.) from an area of their higher concentration to an area of their lower concentration. that is. along their concentration gradient Movement of fats‚ oxygen‚ carbon dioxide through the lipid portion of the membrane‚ and ions through protein channels under certain conditions Osmosis Kinetic energy Simple diffusion of water through a selectively permeable membrane
Premium Cell membrane Diffusion
Diffusion is one of several transport phenomena that occur in nature. A distinguishing feature of diffusion is that it results in mixing or mass transport without requiring bulk motion. Thus‚ diffusion should not be confused with convection or advection‚ which are other transport mechanisms that use bulk motion to move particles from one place to another. In Latin‚ "diffundere" means "to spread out". There are two ways to introduce the notion of diffusion: either a phenomenological approach starting
Premium Diffusion
pores of the bag. Sucrose was not able to pass through as the molecules were too big to enter. This is similar to a cell because the size of a molecule can determine whether or not the substance can enter the cell through diffusion. Larger molecules will require facilitated diffusion‚ using a transport protein‚ or active transport‚ using a transport protein and also ATP (HyperPhysics.edu). Since water can pass through the dialysis
Premium Osmosis Cell membrane Chemistry
Diffusion is when molecules move into available space. It’s the spread of something more widely. Substances diffuse in high concentrated area to a low concentrated area. Water is one molecule that can diffuse freely in a cell. Other molecules need assistance through the cell membrane through a process called facilitated diffusion. Osmosis moves from an area of low concentration to high concentration. In osmosis water moves in the opposite way. Water flow is determined by the concentration‚ not
Premium Osmosis Diffusion Cell membrane
*Passive processes Diffusion: The Principle Diffusion – When molecules and ions level out concentration. Equilibrium – When the substance is evenly spread out through the substance and the concentration gradient disappears. Simple Diffusion – Substances diffuse across the membrane in one of two ways: Lipid-soluble substances diffuse through the lipid bilayer. Ions diffuse through the pores of ion channels formed by integral proteins. Facilitated Diffusion – When substances that cannot
Premium Cell membrane Cell Diffusion
against the gradient‚ it is active and requires energy. Passive transport describes the movement of substances down a concentration gradient and does not require energy consumption. There are many types of passive transport‚ for example: Diffusion‚ diffusion is the net movement of substances from an area of higher concentration to an area of lower concentration. This movement occurs as a result of the random and constant motion characteristic of all molecules‚ atoms‚ or ions (due to kinetic energy)
Premium Cell Cell membrane Bacteria
different sucrose concentrations on potato stripes which have been submerged in a range of solute sucrose concentrations. II. Background Information Osmosis is one of the four methods of moving particles across membranes along with simple diffusion‚ facilitated diffusion‚ and active transport. Water is able to move in and out of most cells freely. Sometimes the number of water molecules moving in and out is the same and there is no net movement‚ but at other times the molecular movement from one direction
Premium Osmosis Chemistry Concentration
Lecture: Plasma Membrane and Transport I. Structure of the Plasma Membrane A. plasma membrane - the surface encapsulating a cell B. Fluid Mosaic Model 1. bilayer of phospholipids a. hydrophilic heads - P04 end "water" "loving" attracted to water on inner/outer parts of cell b. hydrophobic tails - fatty acids "water" "fearing" attracted to each other on inside of bilayer c
Premium Cell Cell membrane Osmosis
Using dialysis tubing to model diffusion of a cell membrane and investigating the influence of solute concentration on osmosis Purpose * Discover how dialysis tubing diffuses the cell membrane * Explore the effect of solute concentration on osmosis Background A cell membrane is a very significant function in the human body. In one sense‚ it is used as a barrier to keep the enzymes‚ DNA‚ and metabolic pathways that bundles everything together. Cell membranes are also used as a gateway
Premium Diffusion Osmosis Semipermeable membrane