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How do we distinguish a strong stimulus from a weak one when the information about both stimuli is relayed by action potentials that are all the same amplitude?

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter6: The Peripheral Nervous System: Afferent Division; Special Senses

Section: Chapter Questions

Problem 2RE

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Does the action potential in a single axon increase in amplitude when the stimulus amplitude is increased? Does the amplitude of the CAP increase because more fibers are firing, or the amplitude of the action potentials from single fibers are increasing, or a combination of both?
Which of the following is true regarding the difference between graded and action potentials? a.) Action potential occur only when the surface of the neuron is myelinated, but graded potentials occur in both in both myelinated and non-myelinated neurons. b.) The magnitude of action potential depends on the magnitude of the stimulus, whereas graded potentials are all or none. c.) The magnitude of graded potential depends on the magnitude of the stimulus, whereas action potentials are all or none.
Which of the following is the correct sequence of the neural chain of events set in motion by an environmental stimulus? (A) Receptors, afferent neurons, interneurons, efferent neurons, effectors (B) Receptors, efferent neurons, interneurons, afferent neurons, effectors (C) Interneurons, effectors, receptors, afferent neurons, efferent neurons (D) Effectors, interneurons, receptors, afferent neurons, efferent neurons (E) Effectors, receptors, afferent neurons, effer- ent neurons, interneurons
Applying a pressure stimulus to the fluid-filled capsule of an isolated Pacinian corpuscle causes a brief burst of action potentials in the afferent neuron, which ceases until the pressure is removed, at which time another brief burst of action potentials occurs. If an experimenter removes the capsule and applies pressure directly to the afferent neuron ending, action potentials are continuously fired during the stimulus. Explain these results in the context ofadaptation.
Explain how stimulus intensity can be coded by action potentials if all action potentials are identical.
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A pin can be pressed against the skin lightly and elicit no response from the pain receptor. However, if the pin is jabbed into the finger, the pain receptor may be stimulated and the finger would quickly be withdrawn through a reflex arc. Use what you know about threshold potential and the all-or-none principle to explain different levels of sensation (light touch or pain)
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If the response to a stimulus is a change from a negative potential to a less negative potential, the change is called: stimulus response Repolarization Depolarization Stimulus recovery
Compared to an action potential, a graded potential is weak and depending on the stimulus strength will dissipate away from the stimulus. O is weak and depending on the stimulus strength will maintain its strength as it travels. O is all-or-none, and maintains it strength as it travels. O is all-or-none but weakens as it travels.
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Describe the nature of the generator potential and explain its relationship to stimulus intensity and to frequency of action potential production.