Other Types of Transport PPT Notes & Activity
Other Types of Transport PPT Notes & Activity
Other Types of Transport PPT Notes & Activity
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Name ___________________________________ _____/_____/______ Period _____ Score: ______/15Protein channelsCorrected by _______________________________________<strong>Other</strong> <strong>Types</strong> <strong>of</strong> <strong>Transport</strong> <strong>PPT</strong> <strong>Notes</strong> & <strong>Activity</strong>Cells function similarly in all living organisms.Diffusion and osmosis do not require ____________ from thecell. This is because the molecules move with a concentrationdifference (from higher to lower). ____________ molecules likesugars, starches, and proteins sometimes diffuse through__________ ____________. Because the molecules movefrom greater to lesser concentration through the channels, thisprocess also does not require energy.Active transportSometimes a cell needs to move molecules ____________ a concentration difference (from lower tohigher concentration). Active transport is a process that allows molecules to move across the cellmembrane from lower to higher concentrations. Active transport requires energy. ____________molecules act as “pumps” to move the molecules across the cell membrane. Your ____________ cellshave lots <strong>of</strong> protein pumps to move ions across the cell membrane. This is how signals travel through yournervous system.<strong>Other</strong> types <strong>of</strong> active transportA cell can take in larger particles <strong>of</strong> food by“____________” them. The cell membrane forms apocket around the particle. Once inside the cell, thepocket breaks loose from the cell membrane. It forms a____________ within the cytoplasm. Cells also sendmaterial out <strong>of</strong> the cell in the same way. When thishappens, a vacuole ____________ with the cellmembrane and the contents are forced outside <strong>of</strong> thecell. Both <strong>of</strong> these processes are types <strong>of</strong> active transportbecause they require energy.
Why are cells so small?One characteristic <strong>of</strong> cells is that they are very ____________. Why? The answer has to do with thecell membrane. Everything the cell needs to take in or has to get rid <strong>of</strong> has to go through the cellmembrane. Therefore the cell membrane needs to have a large ____________ _________ inrelation to the ____________ <strong>of</strong> the cell.The surface area-to-volume ratio is the area <strong>of</strong> the cell’s outer surface in relationship to itsvolume.Volume: Volume (cm 3 ) is the __________ inside an object. Sothe volume <strong>of</strong> a cube with 2 cm sides is 2 X 2 X 2 = 8Surface: Surface (cm 2 ) is the _____________ <strong>of</strong> an object. Acube has 6 sides, so its surface area is 2(2x2) + 2(2x2) + 2(2x2) =24As a cell gets bigger, so does its surface area. However, the volume <strong>of</strong> a cell increases at a____________ rate than the surface area <strong>of</strong> its cell membrane. If a cell gets too large, its cellmembrane will not have enough ____________ to meet the demands <strong>of</strong> its volume. This limits the____________ <strong>of</strong> cells. One way to increase surface area is to make the cell ____________ and____________ or skinny and flat. The nerve cells in your body are very long and thin.------------------------------------------------------------------------------------------Cell Membrane <strong>Transport</strong> <strong>Activity</strong> (10 points)DEMONSTRATE an understanding <strong>of</strong> the movement <strong>of</strong> molecules across a cell membrane.Materials:four candies 2 twist ties 1 plastic shopping bag a pair <strong>of</strong> scissorsProcedure: Your task is to get four candies into a plastic shopping bag. Sounds pretty easy, but here area few rules that you must follow that make the task a little more <strong>of</strong> a challenge.Rules:1. The four candies MUST enter the bag at the same time.2. The four candies MUST enter through the solid part <strong>of</strong> the bag (NOT the opening at the top).3. The internal environment <strong>of</strong> the bag must not be exposed to the external environment.4. When the candy finally enters the bag it must remain together in the form <strong>of</strong> a cluster.5. Do NOT eat the candy until you have completed the task and shown the solution toyour teacher.6. Do NOT discuss any part <strong>of</strong> this activity with any other groups in the class.7. Failure to follow any <strong>of</strong> these rules will result in a zero for this activity.Teacher’s Initials _______________