Human Anatomy
9th Edition
ISBN: 9780135168059
Author: Marieb, Elaine Nicpon, Brady, Patricia, Mallatt, Jon
Publisher: Pearson Education, Inc.,
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Textbook Question
Chapter 12, Problem 8RQ
A synapse between a terminal bouton and a neuron cell body is classi�ed as
(a) axodendritic, (b) axoaxonic, (c) axosomatic, (d) axoneuronic.
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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.
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
Which statement is true regarding the neuron synapse?
B) binging of a neurotransmitter on the postsynaptic neuron membrane can generate an action potential in that neuron
C) the binding of a neurotransmitter always causes an excitatory effect on that cell, never inhibitory
D) the presynaptic and pastsynaptic neuron membranes are not physically separated
Chapter 12 Solutions
Human Anatomy
Ch. 12 - In which direction are afferent signals carried?...Ch. 12 - What subdivision of the nervous system regulates...Ch. 12 - What type of sensation is (a) pain from a pulled...Ch. 12 - Which type of neuron process receives stimuli?Ch. 12 - Describe how the electrical impulse from one...Ch. 12 - What is the structural type of most sensory...Ch. 12 - Which structural type of neuron is most abundant?...Ch. 12 - Which neuroglia make myelin in the CNS? In the...Ch. 12 - Which neuroglia are common in regions where...Ch. 12 - Do Schwann cells cover nonmyelinated axons in the...
Ch. 12 - Name the connective tissue wrapping that encloses...Ch. 12 - Where do synaspes occur in the CNS, in white...Ch. 12 - Why is white matter white?Ch. 12 - If there is no interneuron in a reflex arc, as in...Ch. 12 - If you touch a hot stove, you reflexively...Ch. 12 - What type of neuronal circuit contains multiple...Ch. 12 - Both peripheral nerves and the white matter of the...Ch. 12 - From your understanding of the functions of myelin...Ch. 12 - What type of neurons form from neuroblasts in the...Ch. 12 - How does the development of sensory neurons...Ch. 12 - Prob. 1RQCh. 12 - Match the names of the cells in column B with the...Ch. 12 - Prob. 3RQCh. 12 - Prob. 4RQCh. 12 - An example of an effector is (a) the eye, (b) a...Ch. 12 - Prob. 6RQCh. 12 - A ganglion is a collection of (a) neuron cell...Ch. 12 - A synapse between a terminal bouton and a neuron...Ch. 12 - Myelin is most like which of the following cell...Ch. 12 - Prob. 10RQCh. 12 - Afferent neurons of the PNS synapse in the CNS...Ch. 12 - Prob. 12RQCh. 12 - Prob. 13RQCh. 12 - Place the connective tissue coverings surrounding...Ch. 12 - Define proprioception.Ch. 12 - Prob. 16RQCh. 12 - Prob. 17RQCh. 12 - Distinguish gray matter from white matter of the...Ch. 12 - What is distinctive about the appearance of a cell...Ch. 12 - Describe the differences between neurons and...Ch. 12 - Distinguish a nerve from a nerve fiber and a...Ch. 12 - Prob. 22RQCh. 12 - Draw a reflex arc in place in the nervous system...Ch. 12 - Prob. 24RQCh. 12 - Why are the cell bodies of sensory neurons located...Ch. 12 - Prob. 26RQCh. 12 - Two anatomists were arguing about a sensory...Ch. 12 - An MRI scan and other diagnostic tests indicated...Ch. 12 - Prob. 3CRCAQCh. 12 - Rochelle developed multiple sclerosis when she was...Ch. 12 - Reflexes can be somatic (as in the knee-jerk...Ch. 12 - Prob. 6CRCAQ
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- Which factors in the establishment of the membrane potential are considered in the Nernst equation? (i) Coulomb force; (ii) Ion concentration; (iii) Length of the axon; (iv) Number of dendrites; (v) Permeability of the cell membrane. Select one: a. (i), (iii), (iv) b. (ii), (iii) c. (ii), (iv), (v) d. (i), (ii)arrow_forwardWhat happens when a resting neuron’s membranedepolarizes?(A) There is a net diffusion of Na+out of the cell.(B) The equilibrium potential for K+(EK) becomesmore positive.(C) The neuron’s membrane voltage becomesmore positive.(D) The cell’s inside is more negative than the outsidearrow_forwardWhich of the following statements concerning synapses is FALSE? O A) Modulation of synaptic strength can be presynaptic of postsynaptic B) High frequency stimulation in the presynaptic neuron often leads to DECREASED neurotransmitter release O C) Modulation of synaptic strength can either be short term, lasting seconds, or long term, lasting as long as a lifetime. D) Agonists are drugs that mimic neurotransmitters and antagonists are drugs that block the action of neurotransmitters O E) Certain drugs prevent the reuptake of neurotransmitter from the synapsearrow_forward
- In SA nodal cells the upstroke of the action potential:A)is characterized by a substantial overshoot component.B)results from rapid inward movement of Na+.C)results from inward movement of Ca2+D)results from inward movement of K+.arrow_forwardWhich of the following is the role of axonal Calcium (Ca2+) channels in neuronal communication at the synapse? a) they inhibit the action potential causing it to stop b) Calcium channels have no role in this process c) by allowing calcium to exit the cell, they promote the propagation of action potential across the synapse by creating depolarization d) by blocking calcium entrance, they mediate the contraction of presynaptic axon to facilitate movement e) when they open, calcium enters the presynaptic terminal, promoting fusion of neurotransmitter vesicles with presynaptic membrane, and release of neurotransmitters to the synaptic cleftarrow_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
- A 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_forward39) what happens when the neurotransmitter binding causes Na to move into the post synaptic cell? a) neither of these b) IPSP c) EPSP d) both of thesearrow_forwardA neuron is moving from a voltage of -60 mV to -40 mV. This neuron is .... A) hyperpolarizing B) is making a contraction. C) repolarizing D)depolarizingarrow_forward
- Synaptic cleft has what? A)stores neurotransmitters when they are not in use B)contains myosin and actin C)is located in the sarcoplasm D)is a space where neurotransmitters are released from the neuronarrow_forwardWhen a neuron fires an action potential, closing of the voltage-gated Na+ channels helps to bring an end to _________. A) the depolarizing phase of the action potential B) the repolarizing phase of the action potential C) graded potential changes D) the resting potential E) vesicle fusion at the synapsearrow_forwardIf you increase the amount of neurotransmitter in the synaptic cleft, how would you expect the post-synaptic potential (PSP) to change? a) The PSP would be stronger b) The PSP would change from depolarizing to hyperpolarizing c) The PSP would not changearrow_forward
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