BIOLOGY
5th Edition
ISBN: 9781264104680
Author: BROOKER
Publisher: MCG
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Question
Chapter 5.4, Problem 2CS
Summary Introduction
To determine: The ion gradients which are responsible for the conduction of action potentials across the plasma membrane of a neuron.
Introduction: The action potential is the minimum amount of the charge needed to cause the polarization of a membrane for a very small amount of time. The neurons are in the depolarized state hence action potential is the amount of charge that can cause polarization in the membrane.
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Questions
11. What is an IPSP?
12. GABA receptors on the postsynaptic neuron function as ion channels for which
ion?
13. Based on the data collected, when is it more possible for an action potential to
occur? When the intracellular Cl- concentration in the postsynaptic neuron increases
or when the number of GABA receptors on the postsynaptic membrane increases?
14. Explain
Action Potential of Neurons Worksheet
1. Explain how an action potential and graded potential are different. Where do they occur on a
neuron? How long does each last? What kind of gates is each process using?
2. Describe the following in your own words
a.
resting potential
C.
hyperpolarization
e.
threshold
9.
3.
What triggers an action potential? What happens to the membrane to trigger an action potential?
4. What is a positive feedback loop? How does a neuron create a positive feedback loop (self-
propagation)
5.
What is the role of the voltage-gated sodium channels for producing an action potential?
6. What is the role of the voltage-gated potassium channels?
7.
What would happen if the voltage gated sodium channels
a. Never opened?
b. Stayed open longer than normal?
8.
What is the absolute refractory period? What is the relative refractory period?
Consider the following three diagrams of a nerve cell membrane. They show resting potential,
depolarization, and hyperpolarization.…
Chapter 5 Solutions
BIOLOGY
Ch. 5.1 - Core Skill: Modeling The goal of this modeling...Ch. 5.2 - Prob. 1CSCh. 5.3 - Prob. 1CCCh. 5.3 - Prob. 2CCCh. 5.4 - Prob. 1CSCh. 5.4 - Prob. 2CSCh. 5.4 - Lets suppose the inside of a cell has a solute...Ch. 5.5 - What is the purpose of gating?Ch. 5.5 - Prob. 1EQCh. 5.5 - Prob. 2EQ
Ch. 5.5 - Prob. 3EQCh. 5.6 - What is the function of the protein coat?Ch. 5 - Prob. 1TYCh. 5 - Which of the following events can never be...Ch. 5 - Lets suppose an insect, which doesnt maintain a...Ch. 5 - Prob. 4TYCh. 5 - Prob. 5TYCh. 5 - Prob. 6TYCh. 5 - Prob. 7TYCh. 5 - Prob. 8TYCh. 5 - Prob. 9TYCh. 5 - Large particles or large volumes of fluid can be...Ch. 5 - With your textbook closed, draw and describe the...Ch. 5 - Prob. 2CQCh. 5 - Prob. 3CQCh. 5 - Prob. 1COQCh. 5 - With regard to bringing solutes into the cell...
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- voltmeter microelectrode electrode Giant squid axon A voltmeter was used to measure the potential difference across the cell membrane of a giant squid axon. Which of the following best explains the voltmeter reading? Select one: a. The threshold potential has not been reached. b. The sodium potassium exchange pumps are working to take out the sodium ions and bring in the potassium ions. c. The potassium ions have rushed out of the axon, and the potassium channels are slow to shut down. d. The sodium ions have rushed into the axon, and the sodium channels are closing.arrow_forwardSolve this problem quickly fastarrow_forwardQuestion:- On a neuron, where is it unlikely for voltage activated potassium channels, sodium channels or calcium channels to be found ? Or is it found everywhere?arrow_forward
- Ne ansmitter I. Sequencing Arrange the events that occur during synaptic transmission. Use letters A-F to denote the correct sequence. Use the diagram on the right as a clue. SENDING NEURON Example: vessces Synepte B1. lon channel opens SYNGPSE 1. lon channel opens 2. Neurotransmitter is released into synaptic SYNAPTac CLEFT cleft RECEMNG NEURCN4 3. Vesicle fuses with plasma membrane Jon chen nels Neurotren s mitter F eptor Neurotrensmitter broken down znd setacsed 4. Neurotransmitter binds to receptor Bons 5. Action potential arrives burnu 6. lon channel closesarrow_forwardHow does a voltage clamp work? Group of answer choices -It holds the current across a neuronal membrane constant and measures the changes in voltage. -It holds the voltage of a neuron constant by injecting current equal to the ionic current passing across the cell membrane -It changes the membrane potential of a neuron using two extracellular electrodes. -It inactivates ion channels so that the only current passing into the cell is delivered by the equipment. -It measures the voltage of a neuron that is placed in the preparationarrow_forwardneedarrow_forward
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