Which neuron would probably have the fastest traveling action potentials? O Axon 10 µm and myelinated Axon 10 µm and unmyelinated O Axon 1 um and unmyelinated As long as temperature is constant, they will conduct action potentials at the same speed. O None of the above, axons do not conduct action potentials, dendrites do.

Which neuron would probably have the fastest traveling action potentials? O Axon 10 µm and myelinated Axon 10 µm and unmyelinated O Axon 1 um and unmyelinated As long as temperature is constant, they will conduct action potentials at the same speed. O None of the above, axons do not conduct action potentials, dendrites do.

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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structures in the following diagram of a neuron. ?do it
Once an action potential reaches a neurotransmitter release site, the release of the neurotransmitter is triggered by: The influx of Na* through voltage-gated channels. O The efflux of Na* through voltage-gated channels. The influx of K* through voltage-gated channels. The efflux of K+ through voltage-gated channels. The influx of Ca²+ through voltage-gated channels. O The efflux of Ca2+ through voltage-gated channels.
Which of the following is NOT true of glial cells? O They form the myelin for axons. O They are outnumbered 10 to 1 by neurons in the nervous system. They deliver fuel molecules to neurons and remove the waste products of metabolism. O They are important for the growth and development of the nervous system. O They regulate the composition of the extracellular fluid in the CNS.
Which of the following situations in a neuron results in action potentials that have extended depolarization phases? O None of these result in extended depolarization phase. O Compromising the inactivation mechanism in voltage-gated Na* channels. O Stimulating the voltage-gated K* channels. O Inhibiting the voltage-gated Na* channels. O Compromising the inactivation mechanism in voltage-gated K* channels.
What stage of the action potential is illustrated by the set up shown? interstitial fuid axon cytoplasm interstitial fiuid Resting potential Hyperpolarization O Depolarization Repolarization K'charnel
What drives K+ ions through voltage gated channels while funny channels are also open? O pifference in K+ concentration across the PM O pressure potential O Both difference in K+ concentration across the PM and Membrane potential (difference in charge across the membrane) O Osmotic potential O Membrane potential (difference in charge across the membrane)
You 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 observed
All of the following are true for neurons EXCEPT neurons must produce many proteins neurons are electrically excitable cells neurons have a relatively high consumption of oxygen neurons undergo mitosis
Which of the following statements is FALSE? (Choose the best answer) O Neurons in the nervous system use electrical and chemical synapses to communicate between neurons and their target cells. Chemical synapses allow presynaptic neurons to excite or inhibit the postsynaptic neurons. O Electrical synapses allow presynaptic neurons to excite or inhibit the postsynaptic neurons. O Electrical synapses allow direct exchanges of both electric current and cytoplasmic contents. A single neuron uses either the electrical or chemical synapses to communicate with its target cells.
1.25 p Question 22 Which statement below best describes why action potentials travel in only one direction? O The all-or-none principle explains this. O They have a refractory period. O The diameter of the axon explains this. O Only sodium- and potassium-gated channels are found on the axon. O They have myelinated axons. • Previous Next Not saved Submi
Researchers have designed a neuron that's unable to produce and release neurotransmitters. Can that neuron still have an action potential? Choose the answer with the correct answer and the correct reasoning. O No, action potentials need neurotransmitters to increase message speed O No, a neuron can't receive messages without its own neurotransmitters O No, a lack of neurotransmitters would leave a neuron unmyelinated O No, action potentials don't occur in the axon O Yes, action potentials don't require neurotransmitters:
You are studying a cross-sectional tissue slice of a nerve using a transmission electron microscope. You find an area where there appears to be a small amount of cytoplasm surrounded by about 100 layers of stacked cell membranes. You conclude that you have found a neuron cell body. O a synapse. an unmyelinated axon. O a myelinated axon.