Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN: 9780134580999
Author: Elaine N. Marieb, Katja N. Hoehn
Publisher: PEARSON
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Textbook Question
Chapter 11, Problem 8RQ
The anatomical region of a multipolar neuron where the AP is initiated is the (a) soma, (b) dendrites, (c) axon's initial segment, (d) axon terminals.
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Which of the following is the most direct result of depolarizingthe presynaptic membrane of an axon terminal?(A) Voltage-gated calcium channels in the membrane open.(B) Synaptic vesicles fuse with the membrane.(C) Ligand-gated channels open, allowing neurotransmittersto enter the synaptic cleft.(D) An EPSP or IPSP is generated in the postsynaptic cell.
Select the best answer or answers from the choices given: The anatomical region of a multipolar neuron where the AP is initiated is the (a) soma, (b) dendrites, (c) axon hillock, (d) distal axon.
Why are action potentials usually conducted in one direction?(A) Ions can flow along the axon in only one direction.(B) The brief refractory period prevents reopening of voltagegated Na+channels.(C) The axon hillock has a higher membrane potential thanthe terminals of the axon.(D) Voltage-gated channels for both Na+and K+open in onlyone direction.
Chapter 11 Solutions
Human Anatomy & Physiology (11th Edition)
Ch. 11 - Prob. 1RQCh. 11 - 2. Match the names of the supporting cells found...Ch. 11 - 4. Assume that an EPSP is being generated on the...Ch. 11 - 5. The velocity of nerve impulse conduction is...Ch. 11 - 6. Chemical synapses are characterized by all of...Ch. 11 - Prob. 5RQCh. 11 - Prob. 6RQCh. 11 - 9. Inhibition of acetylcholinesterase by poisoning...Ch. 11 - 8. The anatomical region of a multipolar neuron...Ch. 11 - 11. An IPSP is inhibitory because (a) it...
Ch. 11 - 12. Identify the neuronal circuits described by...Ch. 11 - 13. Explain both the anatomical and functional...Ch. 11 - 14. (a) Describe the composition and function of...Ch. 11 - 15. (a) What is myelin? (b) How does the...Ch. 11 - 16. (a) Contrast unipolar, bipolar, and multipolar...Ch. 11 - 17. What is the polarized membrane state? How is...Ch. 11 - 18. Describe the events that must occur to...Ch. 11 - 19. Since all APs generated by a given nerve fiber...Ch. 11 - 20. (a) Explain the difference between an EPSP and...Ch. 11 - 21. Since at any moment a neuron is likely to have...Ch. 11 - Prob. 22RQCh. 11 - Prob. 13RQCh. 11 - 25. Briefly describe the three stages of neuron...Ch. 11 - 2. Local anesthetics block voltage-gated Na+...Ch. 11 - 3. When admitted to the emergency room, Sean was...Ch. 11 - 4. Rochelle developed multiple sclerosis when she...Ch. 11 - 5. In the Netherlands a young man named Jan was...Ch. 11 - Nursing Student with Neuropathic Pain Tamara Costa...Ch. 11 - Nursing Student with Neuropathic Pain Tamara Costa...Ch. 11 - Nursing Student with Neuropathic Pain
Tamara...Ch. 11 - Nursing Student with Neuropathic Pain Tamara Costa...Ch. 11 - Nursing Student with Neuropathic Pain Tamara Costa...
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- Saltatory conduction is a term applied to the "jumping" movement of action potentials Multiple Choice a) along the postsynaptic membrane from dendrite to axon hillock. b) along myelinated axons. c) from one neuron to another. d) in two directions at the same time. e) across electrical synapses.arrow_forwardwhere does repolarization need to happen on the myelinated neurons? a.) along the entire length of the neuron b.) only at the nodes of Ranvier c.) Only at the synaptic vesicles d.) only at the terminal boutonarrow_forwardDuring the refractory period a) if a neuron reaches threshold the action potential goes to completion b) No stimulus of any strength will trigger a new action potential c) It is possible to trigger a new action potential but only with an unusually strong stimulus d) The signal grows weaker with distance e) The neuron fires at its maximum voltage if a stimulus depolarizes the neuron to thresholdarrow_forward
- (a) What is myelin? (b) How does the myelination process differ in the CNS and PNS?arrow_forwardWhere does repolarization need to happen on myelinated neurons? a.) Along the length of the neuron b.) Only at the nodes of Ranvier c.) Only at the synaptic vesicles d.) Only at the terminal boutonarrow_forwardThe loss of positive ions from the interior of a neuron produces, (a) depolarization. (b) threshold. (c) hyperpolarization. (d) an action potential.arrow_forward
- Action potentials move along different axons at different speeds. The slowest speed of conduction will be found in A) large unmyelinated axons B) small unmyelinated axons C) large myelinated axons D) small myelinated axonsarrow_forwardA synapse between a terminal bouton and a neuron cell body is classified as (a) axodendritic, (b) axoaxonic, (c) axosomatic, (d) axoneuronic.arrow_forwardThe opening of potassium (K+) channels on dendrites of a postsynaptic neuron will have what effect? A) Depolarization B) EPSP C) Hyperpolarization D) IPSP E) Both A and B are correct F) Both C and D are correctarrow_forward
- 23) myelination of an axon is decreases the speed of actio potential. a) true b) falsearrow_forwardWhat is the name of theterminal portion of the axon?arrow_forward(b) Use Figure Q1(b) of an action potential to answer questions (i) until (iv) below. Choose the correct letter to represent each condition. (i) The neuron cannot fire an action potential because it is in a refractory period. (ii) The membrane potential is about -70 mV. (iii) The voltage-gated Na+ channels activation gates are closed, but the inactivation gates are open. (iv) Both gates of the voltage-gated Na+ channels are open. C Threshold B A E Figure Q1 (b)arrow_forward
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