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.
During 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 threshold
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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- 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.arrow_forwardThe loss of positive ions from the interior of a neuron produces, (a) depolarization. (b) threshold. (c) hyperpolarization. (d) an action potential.arrow_forwardAction 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_forward
- The 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_forwardA synapse between a terminal bouton and a neuron cell body is classified as (a) axodendritic, (b) axoaxonic, (c) axosomatic, (d) axoneuronic.arrow_forward23) myelination of an axon is decreases the speed of actio potential. a) true b) falsearrow_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_forwarda) what letter represents dorsal white column b) what letter represents structure that carrys motor impulses from CNS to skeletal muscles? c) What letter represents structure that houses cell bodies of general somatic afferent neurons?arrow_forward9) the period after an initial stimulus when a neuron can not be sensitive to another stimulus is the ....? a) resting period b) relative refractory period c) depolarization d) absolute refractory periodarrow_forward
- The initial rise in the membrane potential of an axon upon stimulation is called the........... phase of the ...............arrow_forwardMyelin in the CNS is produced by (a) astrocytes, (b) microglial cells, (c) oligodendrocytes, (d) ependymal cells.arrow_forwardIn a myelinated axon a special form of propagation occurs known as saltatory conduction. a). Explain how this form of propagation occurs? b). What is the main benefit of this form of propagation?arrow_forward
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