Human Anatomy (9th Edition)
9th Edition
ISBN: 9780134320762
Author: Frederic H. Martini, Robert B. Tallitsch, Judi L. Nath
Publisher: PEARSON
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Textbook Question
Chapter 13, Problem 15RFT
Axons terminate in a series of fine extensions known as
(a) telodendria.
(b) synapses.
(c) collaterals.
(d) hillocks.
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A synapse between a terminal bouton and a neuron cell body is classified as (a) axodendritic, (b) axoaxonic, (c) axosomatic, (d) axoneuronic.
Both electrical and chemical synapses trigger passage of ions across the post-synaptic membrane. (i) Which one of these
synapses also allows passage of molecules other than ions across the post-synaptic membrane? (ii) What purpose does an
electrical synapse serve?
A. Electrical synapse; (ii) dissociate neuronal firing among a group of neurons
B. Chemical synapse, (ii) to synthesize IP3
C. (i) Chemical synapse, (ii) slow neurotransmission
D. Chemical synapse, (ii) silence neuronal firing
O E. (i) Electrical synapse, (ii) fast neurotransmission for synchronized firing
The loss of positive ions from the interior of a neuron produces, (a) depolarization. (b) threshold. (c) hyperpolarization. (d) an action potential.
Chapter 13 Solutions
Human Anatomy (9th Edition)
Ch. 13 - Match each numbered item with the most closely...Ch. 13 - Prob. 2RFTCh. 13 - Prob. 3RFTCh. 13 - Match each numbered item with the most closely...Ch. 13 - Match each numbered item with the most closely...Ch. 13 - Match each numbered item with the most closely...Ch. 13 - Prob. 7RFTCh. 13 - Prob. 8RFTCh. 13 - Prob. 9RFTCh. 13 - Prob. 10RFT
Ch. 13 - 11. Which of the following is not a function of...Ch. 13 - Neuroglia found surrounding the cell bodies of...Ch. 13 - The most important function of the cell body of a...Ch. 13 - Fill in the blanks below with the proper...Ch. 13 - 15. Axons terminate in a series of fine extensions...Ch. 13 - Prob. 16RFTCh. 13 - Prob. 1RCCh. 13 - Prob. 2RCCh. 13 - 3. Developmental problems in the growth and...Ch. 13 - Prob. 4RCCh. 13 - How does exteroceptor activity differ from...Ch. 13 - Prob. 6RCCh. 13 - Prob. 7RCCh. 13 - Prob. 8RCCh. 13 - Prob. 9RCCh. 13 - Prob. 10RCCh. 13 - Prob. 1CTCh. 13 - Prob. 2CTCh. 13 - Prob. 3CT
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- (a) What is myelin? (b) How does the myelination process differ in the CNS and PNS?arrow_forwardSelect 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.arrow_forwardWhich 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.arrow_forward
- If two action potentials come very close to each other in one and the same presynaptic terminal ... Group of answer options ... temporal summation occurs. ... the second action potential beats out the first. ... an IPSP is formed. ... spatial summation takes place.arrow_forwardA common feature of action potentials is that they(A) cause the membrane to hyperpolarize and then depolarize.(B) can undergo temporal and spatial summation.(C) are triggered by a depolarization that reaches threshold.(D) move at the same speed along all axons.arrow_forwardThe myelin sheath is produced around axons in the PNS by (a) ganglia (b) neuron cell bodies (c) dendrites (d) Schwann cells (e) oligodendrocytesarrow_forward
- Myelin in the CNS is produced by (a) astrocytes, (b) microglial cells, (c) oligodendrocytes, (d) ependymal cells.arrow_forwardWhy 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_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
- There is always a synapse between the CNS and the peripheral effector in, (a) the ANS. (b) the SNS. (c) a reflex arc. (d) a, b, and c are correct.arrow_forwardMatch cells and function : Oligodendrocyte , Astrocytes 1. .......................... enhances the velocity of electrical transmission of an action potential along an axon in the CNS. 2. .......................... glial cells act locally to maintain normal electrolyte composition of the cerebrospinal fluid.arrow_forwardAfferent neurons of the PNS synapse in the CNS with (a) axons in the white matter, (b) neuron cell bodies in the gray matter, (c) neuron cell bodies in the white matter, (d) axons in the gray matter.arrow_forward
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