Campbell Biology:conc.(ll)-w/access
9th Edition
ISBN: 9780134784427
Author: Reece
Publisher: PEARSON
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Chapter 29, Problem 10TYK
Construct a graph in which membrane potential is on the y axis and time is on the x axis. Then draw the action potentials that occur when a bitter flavor is absent, followed by the action potentials that result when a person tastes a bitter flavor.
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Chapter 29 Solutions
Campbell Biology:conc.(ll)-w/access
Ch. 29 - Prob. 1CCCh. 29 - Which of the following sensory receptors is...Ch. 29 - Which of the following are not known to be present...Ch. 29 - What do the receptor cells in the lateral line...Ch. 29 - If you look away from this book and focus your...Ch. 29 - Prob. 6TYKCh. 29 - Prob. 7TYKCh. 29 - Prob. 8TYKCh. 29 - Hold your right eye closed. With your left eye,...Ch. 29 - Construct a graph in which membrane potential is...
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- Enumerate the events in action potential and explain what is taking place in each event (focus on the electrical charge, ion channels and movement of ions)arrow_forwardExplain the following; If a drug partly blocks a membrane’s potassium channels, how does it affect the action potential? Suppose the threshold of a neuron were the same as the neuron’s resting potential. What would happen? At what frequency would the cell produce action potentials?arrow_forward________ "mimic" or enhance the action of certain neurotransmitters. Select an answer from the options below Myelinated axons Antagonist drugs Endorphin drugs Agonist drugsarrow_forward
- Based on the graph, how soon could another action potential be easily initiated (at the end of the relative refractory period) after the first stimulus? (Base your answer to this question on the graph below depicting an action potential.) less than 0.5 msec 1 msec 2 msec 3 msec 4 msecarrow_forwardRefer to the graph showing the course of an action potential. Which of the numbered points along the graph represent the time when voltage-gated potassium channels are first activated? a) 1 b) 2 c) 3 d) 4 e) 5arrow_forwardDescribe what makes an incoming signal excitatory. Describe what makes an incoming signal inhibitory. Give typing answer with explanation and conclusionarrow_forward
- An influx of positive sodium ions causes opening of the activation gates of voltage regulated sodium channels resulting in a further influx of positive sodium ions, and thus the initial stages of an action potential are regulated by ______ feedback.arrow_forwardWhich of the following are mechanisms of gustation transduction? Select one or more: a. Hydrogen atoms activate proton channels b. Sodium ions activate sodium channels and a graded potential is produced c. Entry of sodium and calcium causes the cell to depolarize and voltage-gated calcium channels to open d. Calcium ions activate calcium channels and a graded potential is producedarrow_forwardExplain the propagation of an action potential. 1. Start with a stimulus 2. Follow through two points along the axon and include voltage-gated channels involved and their behavior. 3. Passive versus active flow as well as saltatory conductionarrow_forward
- After the action potential reaches its peak, the potential across the membrane falls toward its resting level. What accounts for this recovery? a. The sodium–potassium pump removes the extra sodium. b. Potassium ions move out because their channels are open and the electrical gradient pushes them out. c. Potassium ions move out because their channels are open and the concentration gradient pushes them out. d. Potassium ions move in.arrow_forwardGraph an action potential, showing the change inelectrical potential on the y-axis and time on the x-axis.Indicate on the graph the phases when voltage-gated Na1 andK1 ion channels are opened and when they are closedarrow_forwardFill in the blank: The moment following the passage of an action potential during which a threshold stimulus will not triggeranother impulse is called the ___________________ period.arrow_forward
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