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cell membrane

diffusion of materials across the cell membrane

What three macromolecules make up the cell membrane? Phospholipids, protein channels and carbohydrate receptors
What are the two parts of a phosopholipid and which one is hydrophyllic and which one is hydrophobic The phosopholipid is made up of a head(hydrophyllic and a tail (hydrophobic)
What is the main function of the cell membrane? To provide support and protection for the cell. Also to allow materials to enter and leave the cell to maintain homeostasis.
What does hydrophyllic mean? water loving
What does hydrophobic mean? water fearing
What is passive transport? Moving materials from an area of high concentration to an area of low concentration without using energy.
What does selectively permeable mean? The cell membrane only allows some molecules to enter the cell.
What are the three types of passive transport? diffusion, facillitated diffusion, and osmosis
What happens during diffusion? random movement of molecules from an area of high concentration to an area of low concentration until equilibrium is reached. (equal or evenly spaced)
What happens during facillitated diffusion Molecules are transported or moved through protein channels from an area of high concentration to an area of low concentration.
What happens during osmosis? Water only moves freely across the membrane from high to low concentration through proteins called aquaporins.
What are the three types of concentration when comparing solutions? isotonic,(even, same) hypertonic (high concentration or more solutes) hypotonic (low concentration or less solutes)
What does dynamic equillibrium mean? changing evenly, or moving equally
What does water want to do? water wants to DILUTE the SALUTE
Define salute the dissolved material, what is being dissolved in the solution. examples: sugar, salt
define solvent the liquid portion of the solution. example: water
What is the result of a hypertonic solution to the cell? When the cell is in a hypertonic state, water moves from inside the cell out into the solution causing the cell to shrink.
What is the result of a hypotonic solution? When a cell is in a hypotonic state, water moves from the solution into the cell.
Define cytosis. Cytosis is when a cell swells until it bursts open.
Created by: Dcrawford



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