BIOLOGY
5th Edition
ISBN: 9781265202859
Author: BROOKER
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Chapter 45.2, Problem 1CS
Summary Introduction
To explain: The role of voltage-gated
Introduction: A synapse is defined as a junction where an axon terminal meets another neuron, muscle cell or gland cell. Neurons communicate with other cells at a synapse. An electrical or chemical signal passes from an axon terminal of the neuron to the plasma membrane of the nearby cell at a synapse. The signals are transferred from the presynaptic cell to the postsynaptic cell. In a chemical synapse, a neurotransmitter is released from an axon terminal. It acts as a signal from the presynaptic cell to the postsynaptic cell.
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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.
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4. What is a positive feedback loop? How does a neuron create a positive feedback loop (self-
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5.
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6. What is the role of the voltage-gated potassium channels?
7.
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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.…
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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?
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Chapter 45 Solutions
BIOLOGY
Ch. 45.1 - Prob. 1CCCh. 45.2 - Prob. 1CCCh. 45.2 - Prob. 1CSCh. 45.2 - Prob. 2CSCh. 45.3 - What is the normal function of the PPAR- protein...Ch. 45.3 - CoreSKILL What was the hypothesis proposed by...Ch. 45.3 - CoreSKILL Assume that the mean weight of both...Ch. 45 - Prob. 1TYCh. 45 - Prob. 2TYCh. 45 - Prob. 3TY
Ch. 45 - Prob. 4TYCh. 45 - The function of ATP during muscle contraction is...Ch. 45 - The function of Ca2+ in skeletal muscle...Ch. 45 - Stimulation of a muscle fiber by a motor neuron...Ch. 45 - Muscle fibers that have a large number of...Ch. 45 - Which of the following statements about movement...Ch. 45 - Prob. 10TYCh. 45 - Compare the structural and functional features of...Ch. 45 - Describe as many types of animal locomotion as you...Ch. 45 - Prob. 3CQCh. 45 - List and briefly describe the steps in the...Ch. 45 - Discuss the three types of muscle tissues found in...
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- Given the steps shown below, which of the following is the correct sequence for transmission at a chemical synapse? 1. neurotransmitter binds with receptor 2. sodium ions rush into neuron's cytoplasm 3. action potential depolarizes the presynaptic membrane 4. ion channel opens to allow particular ion to enter cell 5. synaptic vesicles release neurotransmitter into the synaptic cleft O 1, 2, 3, 4, 5 O 5, 1, 2, 4, 3 O 2, 3, 5, 4, 1 O4, 3, 1, 2, 5 O 3, 2, 5, 1, 4arrow_forwardThe correlation between neurons can explain the basis of the synaptic modification, that is, how much they can connect to each other or if they are not synchronized, how much they can lose or weaken their connections. • Draw a picture of an excitatory synapse such as glutamatergic with its receptors between the pre- and postsynaptic neuron. • Briefly explain what mechanisms involve neuronal plasticity and why synapses are enhanced or weakened.arrow_forwardSubject: Neurophysiology Imagine a toxin that blocks voltage gated K channels. What do you expect to see at the neuromuscular junction when you stimulate the pre synaptic neuron? Would you release neurotransmitter? Would the skeletal muscle contract?arrow_forward
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