Anatomy & Physiology
1st Edition
ISBN: 9781938168130
Author: Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble
Publisher: OpenStax College
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Textbook Question
Chapter 12, Problem 26RQ
What does a mechanically gated channel respond to?
- physical stimulus
- chemical stimulus
- increase in resistance
- decrease in resistance
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describe how the membrane potential varies over time AND distance as a graded potential move across the cell body of a neuron. Describe the movement of ions within the cell body as the graded potential moves away from the stimulus
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.
The "All or None" response means that:
A stimulus causes depolarization and repolarization regardless of the strength of
the stimulus
There is no threshold for an electrical stimulus signal to reach before
depolarization and repolarization
O Potassium channels open for depolarization and sodium channels open for
repolarization
A stimulus has to be strong enough for depolarization to occur followed by
repolarization
Chapter 12 Solutions
Anatomy & Physiology
Ch. 12 - In 2003, the Nobel Prize in Physiology or Medicine...Ch. 12 - Visit this site...Ch. 12 - Visit this site...Ch. 12 - View the University of Michigan Webscope...Ch. 12 - What happens across the membrane of an...Ch. 12 - Visit this site...Ch. 12 - Watch this video...Ch. 12 - Watch this video...Ch. 12 - Which of the following cavities contains a...Ch. 12 - Which structure predominates in the white matter...
Ch. 12 - Which part of a neuron transmits an electrical...Ch. 12 - Which term describes a bundle of axons in the...Ch. 12 - Which functional division of the nervous system...Ch. 12 - What type of glial cell provides myelin for the...Ch. 12 - Which part of a neuron contains the nucleus?...Ch. 12 - Which of the following substances is least able to...Ch. 12 - What type of glial cell is the resident macrophage...Ch. 12 - What two types of macromolecules are the main...Ch. 12 - If a thermoreceptor is sensitive to temperature...Ch. 12 - Which of these locations is where the greatest...Ch. 12 - How long does all the signaling through the...Ch. 12 - What is the target of an upper motor neuron?...Ch. 12 - What ion enters a neuron causing depolarization of...Ch. 12 - Voltage-gated Na+ channels open upon leaching what...Ch. 12 - What does a ligand-gated channel require in order...Ch. 12 - What does a mechanically gated channel respond to?...Ch. 12 - Which of the following voltages would most likely...Ch. 12 - Which of the following is probably going to...Ch. 12 - How much of a change in the membrane potential is...Ch. 12 - A channel opens on a postsynaptic membrane that...Ch. 12 - What neurotransmitter is released at the...Ch. 12 - What type of receptor requires an effector protein...Ch. 12 - Which of the following neurotransmitters is...Ch. 12 - What responses are generated by the nervous system...Ch. 12 - When eating food, what anatomical and functional...Ch. 12 - Multiple sclerosis is a demyelinating disease...Ch. 12 - Which type of neuron, based on its shape, is best...Ch. 12 - Sensory fibers, or pathways, are referred to as...Ch. 12 - If a person has a motor disorder and cannot move...Ch. 12 - What does it mean for an action potential to be an...Ch. 12 - The conscious perception of pain is often delayed...Ch. 12 - If a postsynaptic cell has synapses from five...Ch. 12 - Why is the receptor the important element...
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Similar questions
- 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 recoveryarrow_forwardAction potential frequency in phasic receptors with a prolonged stimulus action potential frequency in tonic receptars with a prolonged stimulus. Greater than Less than Equal toarrow_forwardIf depolarization occurs at the neuromuscular junction and threshold is met, then voltage-gated calcium channels in the axon terminal will open. voltage-gated acetylcholine receptors will open. acetylcholine receptors will open and close. ligand-gated channels will open nearby. voltage-gated sodium and voltage-gated potassium channels will open nearby.arrow_forward
- MC: Which of the following changes to an action potential indicates a larger stimulus? Increased frequency Increased wavelength Increased amplitude Increased speedarrow_forwardA specific stimulus produces a receptor potential by :-a- inhibiting Na + influx into receptorb- inhibiting K + efflux from receptorc- enhancing Na + influx into receptord- enhancing K + efflux from receptorarrow_forwardIs dual innervation the same as inhibition?arrow_forward
- Action potentials are generated at receptor sites. If you touch an object that is rough, which one of these structures on a sensory neuron, will be stimulated first and begin the process of sodium entry via chemically gated channels into the nerve cell? O dendrites axons O synaptic terminals cell body of the neuron *Previous Nextarrow_forwardDoes 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?arrow_forwardYou have a photoreceptor cell in a dish. You are recording its membrane potential while flashing different intensities of light. Which of the following would you observe? Group of answer choices The cell hyperpolarizes, with brighter light causing more hyperpolarization than dimmer lights The cell depolarizes, with brighter light causing more depolarization than dimmer lights If the light is bright enough to reach threshold, it will fire an action potential No change in membrane potential will be observedarrow_forward
- 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?arrow_forwardFigure Ql shows the typical electrical recording of movement artifacts during the resting potential and also the action potential when an adequate stimulus is delivered. Potential overshoot (, > 0) Movement artifact Action potential -80 Stimulus artifact Resting potential Figure Ql In your own words, discuss the phenomena occur during the resting state and active state until the equilibrium potential is established. (a) Membrane potential (m), mVarrow_forwardCompared to a large stimulus, how would each variable below change in response to a smaller sensory stimulus? Calcium influx in the sensory cell [ Choose ] Neurotransmitter release [Choose ] Generator potential amplitude [Choose ) Action potential amplitude [Choose)arrow_forward
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