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Biology Cells unit: LT8 Review I can use a neuron to describe how passive and active transport work together to maintain homeostasis. (Answers can be found on the next page.) Fill in the T-chart for passive and active transport. Passive Active Conc. __ __ Conc. __ __ ______ energy _______ energy Examples: Diffusion _ _ _ _ cytosis ? _ _ _ cytosis __________ Diffusion _ _+ / K+ _ _ _ _ Glucose 1. 2. Add labels to the parts of a neuron. Draw an arrow to indicate the direction that the impulse moves through the neuron. Put the images in the correct order to represent the sodiumpotassium pump. The first one is already labeled #1. A. B. C. D. E. Label the image of the action potential moving along an axon with the letters for each question. 1. Where is the beginning of the action potential? 2. In which direction is it moving? 3. Where is the sodium-potassium pump doing its work? 4. What is the charge distribution inside and outside the axon when the neuron is at resting potential? Now that you have some background about neurons and action potentials, work on the original learning target. I can use a neuron to describe how passive and active transport work together to maintain homeostasis. Passive Active 1. 3. 2. Maintains Homeostasis 1. 3. 2. Mrs. Loyd [email protected] Page 1 of 2 5/25/17 http://loydbiology.weebly.com Answers Direction an action potential moves through a neuron. Active + / K+ pump restores 3. Na 1. resting membrane 2. K+ voltage-gated ion channel potential. Maintains Homeostasis: First the sodium channel opens and The Na+ / K+ pump sodium floods in reversing the restores resting polarity. (This is the action potential.) membrane potential Then it closes. (homeostasis) by Second, the potassium channel pumping 3 Na+ out for + opens allowing K out, reducing the every 2 K+ it pumps in. reversal in polarity. Then it closes. Na+ Mrs. Loyd [email protected] Page 2 of 2 Passive voltage-gated ion channel 5/25/17 http://loydbiology.weebly.com