Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 42, Problem 3CQ
Summary Introduction
To determine: The applicability of the core concept, “structure determines the function,” to neurons.
Introduction: Cell is the basic functional unit of life. All living forms are composed of cells. In higher forms, the cells have evolved morphologically to perform specific functions. For example, cells that have large vacuoles often play a role in food storage and nutrition. Similarly, cells that form pseudopodia perform the function of phagocytosis and are part of the immune system.
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Fluorescent FM dyes partition reversibly into biological membranes without penetrating through them. Suppose that you have neurons cultured in a dish. You incubate the neurons with an FM dye, and then you wash them with medium to remove the dye.
You find that if the neurons are stimulated to trigger action potentials during incubation with the dye, the synaptic regions of the neurons remain fluorescent after the wash. Can you explain why this effect may have occurred?
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Central nervous system (CNS) and peripheral nervous system (PNS) are two systems innervous system that control human movement and activity.(a) Describe the pathway of receiving and transferring information in neuron.
Identify and label the following structures on the neuron model figure below: cell body, dendrites,
neuron nucleus, neurolemma, axon hillock, nucleus of Schwann cell, Nissl bodies, myelin sheath,
axon, node of Ranvier, axon terminals (of neurons synapsing with model neuron), endoneurium (refer
to Figure 10.6).
3)
11
Chapter 42 Solutions
Biology
Ch. 42.1 - Prob. 1CCCh. 42.2 - Prob. 1CSCh. 42.3 - Prob. 1CSCh. 42.3 - Prob. 2CSCh. 42.3 - Prob. 1CCCh. 42.3 - Prob. 2CCCh. 42.4 - What key prior observation led Loewi to develop...Ch. 42.4 - CoreSKILL The results of Loewis experiment...Ch. 42.4 - Prob. 3EQCh. 42 - Prob. 1TY
Ch. 42 - Prob. 2TYCh. 42 - The myelin sheath a. is produced by neurons in the...Ch. 42 - Prob. 4TYCh. 42 - Prob. 5TYCh. 42 - Which of the following contribute(s) to the...Ch. 42 - Prob. 7TYCh. 42 - Prob. 8TYCh. 42 - Prob. 9TYCh. 42 - Prob. 10TYCh. 42 - Prob. 1CQCh. 42 - Prob. 2CQCh. 42 - Prob. 3CQCh. 42 - Describe the difference between an electrical...Ch. 42 - Prob. 2COQ
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- . “Facilitation in a neuronal pool” refers to .arrow_forwardDescribe three structures found in neurons that are also in other cell types, and describe two structures that are unique to neurons.arrow_forwardWhen a neuron is a rest, the sodium ions flow through the membrane at a very low rate. Why is this? The sodium ions are negatively charged, and are not drawn into the negatively charged neuron Sodium ions are much larger than calcium, potassium, or chlorine ions Sodium ions always flow through the membrane at a very low rate, whether the neuron is at rest or not at rest The sodium ion channels are closed when a neuron is at restarrow_forward
- With respect to the three structural types of neurons (unipolar, bipolar & multipolar): State which parts of each type of neuron receive information, which parts integrate information, and which parts conduct the output signal of the neuron. Describe the location of the cell bodies of each type of neuron within the nervous system.arrow_forwardStructures in the following diagram of a neuron? Asaparrow_forwardEnteric glia (specialized macrophages) are in close proximity to neurons and outnumber neurons- 4- to 10-fold 5- to 12-fold 3- to 8-fold 2- to 6-foldarrow_forward
- Match the neuron structure with its correct function or description. 1. Structure that receives stimuli and carries impulses to the cell body Grey matter 2. Part of the neuron that releases a chemical transmitter across the synapse + Myelin sheath 3. Cells that protect, nourish, and defend neurons + White matter 4. Structure that contains the neuron's nucleus and is the site of the neuron's cell metabolism : Synapse 5. The gap between two myelin sheaths that allows faster conduction of action potential 6. Lipid, fatty insulating layer around some axons that protects the neurons and speeds the impulses along the neuron + Dendrite 7. Unmyelinated neurons in the CNS + Axon 8. Structure that transmits impulses away from the cell body to another neuron, the muscles, or glands Axon terminal 9. Myelinated neurons in the CNS Cell body 10. The gap or junction between two neurons or between a neuron and a muscle Node of Ranvier * Glial cellarrow_forward(a) Describe the similarities and differences between neurons and typical cells.arrow_forwardFluorescent FM dyes partition reversibly into biological membranes without penetrating through them. Suppose that you have neurons cultured in a dish, and you incubate them with an FM dye for a period of time before washing the cells with excess medium to remove the dye. a) You find that if you stimulate the neurons to trigger action potentials during incubation with the dye, the synaptic regions of the neurons remain fluorescent after the wash. Propose an explanation for this effect. b) After you have generated fluorescent synaptic regions by this procedure, suppose that you trigger further action potentials while continuing to wash with excess medium. Would you expect the synaptic regions to lose fluorescence? Explain.arrow_forward
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