Predatory cone snails are beautiful (picture below), but deadly - they release a cocktail of toxins that affect multiple aspects of neuronal function. One of these toxins is called omega-conotoxin, and it blocks (inhibits voltage-gated calcium channels. What impact would this have on chemical synaptic transmission? O a. Action potentials cannot be initiated Ob. Action potentials can be initiated, but cannot propagate down axons and thus cannot reach terminals Oc. Action potentials can propagate and reach terminals, but neurotransmitter release is not possible o d. Neurotransmitters can be released from terminals, but they cannot bind to receptors

Predatory cone snails are beautiful (picture below), but deadly - they release a cocktail of toxins that affect multiple aspects of neuronal function. One of these toxins is called omega-conotoxin, and it blocks (inhibits voltage-gated calcium channels. What impact would this have on chemical synaptic transmission? O a. Action potentials cannot be initiated Ob. Action potentials can be initiated, but cannot propagate down axons and thus cannot reach terminals Oc. Action potentials can propagate and reach terminals, but neurotransmitter release is not possible o d. Neurotransmitters can be released from terminals, but they cannot bind to receptors

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,...

See similar textbooks

Similar questions

In the autoimmune disease multiple sclerosis, a person's immune system attacks and destroys the myelin sheath cells. What occurs as a result of the destruction of these cells? Action potentials can travel in two directions. None of the answer choices are correct. O The sodium-potassium pumps malfunction. The speed of action potentials decreases. Signals cannot be transmitted across the synapse.
6. Identify the following structures on an image of a synapse: Postsynaptic neuron Presynaptic neuron Neurotransmitter Synaptic cleft Synaptic vesicles Receptor for neurotransmitter Cell adhesion molecules Axon terminal 7. hore CAFE Describe the actions of sodium and potassium during action potential generation as it relates to depolarization, repolarization, and hyperpolarization. State the directional flow of each ion and the state of the gated channels for each stage. See figure 12.15 in the textbook.
In neurons, the direction of signal is always: Up axon to soma (cell body) Down soma (cell body) to dendrites O Up soma (cell body) to dendrites SEP O Down axon terminal to dendrites O Down axon towards axon terminal
There is a type of toxin found in the liver of the puffer fish that prevents the opening of voltage-gated Na+ channels in neurons. The effect of this toxin is to: Group of answer choices A. prevents the initiation of the action potential B. depolarizes the membrane potential and maintains it depolarized C. prolongs the return of the membrane potential to the resting level D. increases the duration of the action potential
Of the following, which must be true for an action potential? I - Action potentials only occur when the threshold potential has been exceeded.II - A stimulus produces a full action potential, or does not produce an action potential at allIII - During the undershoot phase, it is much harder to fire another action potential I, II, and III I only I and III II and III
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 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.
rearrange these in the correct order of events in an action potential.
A theoretical drug blocks Na* leak channels - what effect would this have on a neuron's resting membrane potential and why? Would this drug affect the neuron's ability to generate an action potential and why/why not?
Conduction velocity refers to the [a] at which an action potential travels along a neuron's axon. In invertebrates, conduction velocity can only be increased by [b]. However in vertebrates (exclusively), such as humans, conduction velocity can also be increased by [c]. This enables vertebrates to conserve [d] while still increasing conduction velocity. [a] [b] [c] [d] [Choose ] [Choose ] [Choose ] [Choose ]
4,5,6 and 7 if possible
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: