Human Anatomy & Physiology
1st Edition
ISBN: 9780805382952
Author: Erin C. Amerman
Publisher: PEARSON
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Textbook Question
Chapter 11, Problem 7CYR
Fill in the blanks: The _______is the period of time during which it is impossible to stimulate a neuron to have an action potential, whereas the _______is the period of time during which a larger-than-normal stimulus is required to elicit an action potential.
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Which of the following would occur if a neuron was experimentally stimulated simultaneously at both ends?
The action potentials would pass in the middle and travel to the opposite ends
The action potentials would stop as they meet in the middle.
The stronger action potential would override the weaker action potential.
Summation would occur when the action potentials meet in the middle, resulting in a larger action potential.
Which is the correct order of the firing of a neuron?
a.
resting potential, threshold, action potential, refractory period
b.
resting potential, threshold, refractory period, action potential
c.
action potential, resting potential, refractory period, threshold
d.
threshold, resting potential, refractory period, action potential
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 msec
Chapter 11 Solutions
Human Anatomy & Physiology
Ch. 11.1 - What are the organs of the CNS?Ch. 11.1 - Prob. 2QCCh. 11.1 - Describe the sensory, integrative, and motor...Ch. 11.1 - 4. What are the differences between the somatic...Ch. 11.1 - How does the somatic motor division of the PNS...Ch. 11.2 - What are the functions of the cell body,...Ch. 11.2 - What are the structural differences between...Ch. 11.2 - What are the functional differences between...Ch. 11.2 - What are the functions of astrocytes?Ch. 11.2 - Prob. 5QC
Ch. 11.2 - Prob. 6QCCh. 11.2 - 7. What is the function of the myelin sheath?
Ch. 11.2 - How does the myelin sheath differ in the CNS and...Ch. 11.2 - Are neurons more likely to regenerate in the CNS...Ch. 11.2 - Prob. 10QCCh. 11.3 - 1. What is the resting membrane potential?
Ch. 11.3 - Prob. 2QCCh. 11.3 - What two factors generate the resting membrane...Ch. 11.3 - Prob. 4QCCh. 11.3 - Prob. 5QCCh. 11.3 - In and around the axon, where is the higher...Ch. 11.3 - What is the resting membrane potential, and what...Ch. 11.3 - Prob. 8QCCh. 11.3 - Prob. 9QCCh. 11.3 - Prob. 10QCCh. 11.3 - What takes place during the depolarization phase...Ch. 11.3 - 7. What must be reached in order for...Ch. 11.3 - 8. What takes place during the repolarization and...Ch. 11.3 - 9. What are the absolute and relative refractory...Ch. 11.3 - 10. How do local potentials and action potentials...Ch. 11.3 - Which is useful for long-distance signaling, and...Ch. 11.3 - 12. How is an action potential propagated down an...Ch. 11.3 - Prob. 18QCCh. 11.4 - What are three locations where presynaptic axons...Ch. 11.4 - Define synaptic transmission.Ch. 11.4 - Prob. 3QCCh. 11.4 - Prob. 4QCCh. 11.4 - Prob. 5QCCh. 11.4 - Prob. 6QCCh. 11.4 - Prob. 7QCCh. 11.5 - Prob. 1QCCh. 11.5 - Prob. 2QCCh. 11.5 - Prob. 3QCCh. 11.5 - Prob. 4QCCh. 11.5 - Prob. 5QCCh. 11.6 - 1. Why are neurons organized into neuronal...Ch. 11.6 - Prob. 2QCCh. 11.6 - 3. What mechanisms stabilize neural circuits?
Ch. 11 - Which of the following statements about the...Ch. 11 - 2. Regulation of heart rate, blood pressure, and...Ch. 11 - Match each type of neuroglial cell with its...Ch. 11 - Prob. 4CYRCh. 11 - Prob. 5CYRCh. 11 - Prob. 6CYRCh. 11 - 7. Fill in the blanks: The _______is the period of...Ch. 11 - With respect to the condition of action...Ch. 11 - 9. Identify the following as properties of...Ch. 11 - The trigger for exocytosis of synaptic vesicles...Ch. 11 - Match the following neurotransmitters with their...Ch. 11 - 12. Which of the following is not a method by...Ch. 11 - 13. A ________is characterized by multiple input...Ch. 11 - Mark the following statements as true or false. If...Ch. 11 -
15. Mark the following statements as true or...Ch. 11 - Sequence the following list of events of a...Ch. 11 - 16. Mark the following statements as true or...Ch. 11 - 1. A drug that blocks channels in neurons does so...Ch. 11 - Prob. 2CYUCh. 11 - What conditions must be met for an axon to...Ch. 11 - 4. Explain how an action potential is propagated...Ch. 11 - Prob. 1AYKACh. 11 - 2. During a surgical procedure, an...Ch. 11 - Albert accidentally ingests the poison...Ch. 11 - 4. Albert, the patient in question 3, takes the...Ch. 11 - Predict the effect that tetrodotoxin would have on...Ch. 11 - Explain what would happen if depolarization of the...
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- Fill 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_forwardWhich of the following is true regarding the difference between graded and action potentials? a.) Action potential occur only when the surface of the neuron is myelinated, but graded potentials occur in both in both myelinated and non-myelinated neurons. b.) The magnitude of action potential depends on the magnitude of the stimulus, whereas graded potentials are all or none. c.) The magnitude of graded potential depends on the magnitude of the stimulus, whereas action potentials are all or none.arrow_forwardWhich of the following nerves would be expected to have the slowest conduction rate of action potentials? Only one answer 1. Unmyelinated axon; Diameter: .0001 millimeter 2. Myelinated axon; Diameter: .001 millimeter 3. Unmyelinated axon; Diameter: .005 millimeter 4. Myelinated axon; Diameter: .005 millimeterarrow_forward
- Because the long axons of neurons look like electrical wires, and both neurons and electrical wires conduct electricity, it is tempting to equate the two. Compare and contrast the functioning of axons and electrical wires in terms of their structure and the nature of the electrical signals they conduct. Please include references.arrow_forwardWhen a neuron fires an action potential, the information travels through the axon,the dendrites, and the cell body, but not in that order. Place these three structures in the correct order.arrow_forwardstarting with an axon that is maintaining a resting potential, describe the sequence of events that causes the generation of an action potential, including the electrical charges and ions involved.arrow_forward
- Which of the statements below describe a situation in which the change in membrane potential above could cause the firing of an action potential? Select all that apply. ___If the potential is counteracted by an IPSP. ___If the potential is strong enough to bring the axon hillock to threshold. ___If the neuron is in the relative refractory period. ___If the potential is supplemented by a simultaneous (or near-simultaneous) EPSP.arrow_forwardDamage to neurons from Alzheimer's disease may prevent neurons from receiving signals from other neurons. Which of the following structures of a neuron is first affected by the damage? Select one: a. Axon b. Cell Body c. Axon Terminal d. Dendritesarrow_forwardWhich of the following can increase the likelihood of a neuron generating an action potential? tetrodotoxin (TTX) reducing the external concentration of K+ decreased diffusion of K+ through leak channels out of the neuron All of the abovearrow_forward
- a.Would an action potential travels faster in an axon with a wide diameter or a small diameter? b. Would an action potential travel faster in an axon that is myelinated or unmyelinated?arrow_forwardMC: Which of the following changes to an action potential indicates a larger stimulus? Increased frequency Increased wavelength Increased amplitude Increased speedarrow_forwarddiscuss the process of the neuron firing an action potential from the resting period to the refractory period? Give an example of this in a different scenario.arrow_forward
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