Action Potentials Can Be Propagated by Which of the Following

Which of the following potentials can reach or exceed the. Signals are transmitted across synapses to eventually the soma of a neuron.

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Unmyelinated axons propagate action potential faster than myelinated axons.

. They are propagated in a non-decremental fashion. C Action potentials are propagated down the length of the axon. A supra-threshold stimulus can stimulate an action potential during the absolute refractory period.

The strength of the stimulus determines the frequency of the action potentials. 50 meters per second slowly The jumping fashion of is the result of action potentials moving across the entire myelinated portion of the axon. D Movement of ions during the action potential occurs mostly through the sodium pump.

A local current depolarizes the next segment to threshold and the cycle repeats propagating the action potential along the axon in 1 direction only at a speed of about 1 metersec. Action potentials can be propagated unmyelinated axons or as in as in myelinated fibers. On a graph of an action potential the small depolarizations that lead to threshold are from inhibitory postsynaptic potentials IPSPs.

In other types of cells their main function is to activate intracellular. 21 A After-hyperpolarization B The all-or-none principle. Multiple stimuli can create larger action potentials and fewer stimuli can create smaller action potentials.

How can action potentials relay information about the intensity of a stimulus such as distinguishing between a loud and soft sound. The action potential is a rapid and transient depolarization of the membrane in electrically excitable cells. Signal conduction saltatory conduction 100 meters per second quickly In myelinated axons conduction is about 1 meter per second 4 meters per.

Excitatory postsynaptic potentials EPSPs. Action potentials APs are observed in excitable cells neurons muscle cells and some endocrine cells. An AP is caused by a sudden selective alteration in the permeability of the membrane to small ions.

Refractory period- period immediately following stimulation during which a nerve or muscle is unresponsive. In continuous conduction action potentials only occur at the Nodes of Ranvier. Action potentials generally propagate from the axon terminal toward the initial segment.

Biologically action potentials are propagated in one direction due to how neurons are connected to each other. In neurons action potentials play a central role in cell-to-cell communication by providing for or assisting in with regard to saltatory conduction the propagation of signals along the neurons axon towards boutons at the axon ends which can then connect with other neurons at synapses or to motor cells or glands. B The depolarization from an action potential at one node.

There is a high density of voltage-gated Na channels so that rapid depolarization can take place here. Voltage-gated Na channels can only ever be opened once Voltage-gated K. Action potentials move along an unmyelinated axon by continuous propagation in which the moving action potential affects one segment of the axon at a time.

Continuous propagation- wherein the action potential affects every portion of the membrane surface. Saltatory propagation- action potentials along myelinated axons from one node of Ranvier to the next. In the experiment you show that the action potentials propagate toward the right Which of the following statements provides one reason that the action potential cannot propagate both ways.

The rate of propagation of an action potential down an axon is independent of stimulus strength. The cell that provides the spiral of insulating membrane surrounding the axon is a type of glial cell a. In myelinated axons action potentials depolarize adjacent areas of the cell membrane along the entire length of the axon.

B Action potentials for a given neuron vary in duration. Figure 6-10 The propagation of an action potential along a myelinated nerve fiber. Chemically gated chloride channels opening allowing chloride to enter the neuron.

C- Action potentials are propagated down the length of the axon. Propagation of the Action Potential The action potential is initiated at the beginning of the axon at what is called the initial segment. Voltage-gated potassium channels opening allowing potassium to exit the neuron.

A Cross-section of a myelinated axon showing the spiral wrapping of the glial cell membrane around the axon. Continuous conduction occurs along unmyelinated axons. _____ is the mechanism by which action potentials are propagated in unmyelinated axons.

Which of the following statements about action potentials is correctA Action potentials for a given neuron vary in magnitudeB Action potentials for a given neuron vary in durationC Action potentials are propagated down the length of the axonD Movement of ions during the action potential occurs mostly through the sodium pump. Once they have been opened voltage-gated Na channels cannot open again Immediately. Action potentials can undergo summation.

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