Does IPSP ↑ or ↓ the chances of a postsynaptic neuron to generate an action potential?...
Does IPSP ↑ or ↓ the chances of a postsynaptic neuron to generate an action potential? Explain why.
Homework Answers
An inhibitory postsynaptic potential (IPSP) decreases the chances of a postsynaptic neuron to generate an action potential. In general IPSP makes a postsynaptic membrane more negative (transient hyperpolarization) thereby decreasing chances of action potentials.
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Does IPSP ↑ or ↓ the chances of a postsynaptic neuron to
generate an action potential?...
Assume that a single Inhibitory Postsynaptic Potential (IPSP) has a negative magnitude of -0.5mV at the...
Assume that a single Inhibitory Postsynaptic Potential (IPSP) has a negative magnitude of -0.5mV at the axon hillock, and that a single Excitatory Postsynaptic Potential (EPSP) has a positive magnitude of +0.5mV. For a neuron with initial membrane potential of -70mV, calculate the net effect of the simultaneous arrival of 6 IPSPs and 2 EPSPs on the membrane potential. Show your work.
Fifteen different presynaptic neurons synapse on a single postsynaptic neuron. The postsynaptic neuron has a RMP...
Fifteen different presynaptic neurons synapse on a single postsynaptic neuron. The postsynaptic neuron has a RMP of -70 mV. At the trigger zone, 14 of the presynaptic neurons produce excitatory postsynaptic potentials of 2 mV each, and the other one produces an inhibitory postsynaptic potential of 9 mV. The threshold for the postsynaptic neuron is -50 mV. Will action potentials be produced in the postsynaptic neuron? Is this an example of temporal summation or spatial summation? Explain your answers.
Action Potential Action Potential (AP) arises in presynaptic neuron Travels to Causes End of presynaptic neuron...
Action Potential Action Potential (AP) arises in presynaptic neuron Travels to Causes End of presynaptic neuron Leads to 2 Located in Excitatory Postsynaptic Potential begins at 6 Cl-gates open I s When Causing Depolarization to +30mV next opening 10 Nonmyelinated axons Myelinated axons Current spreads through each segment Current spreads by---- 11 Action Potential Word Bank ŠMU Auso Neurotransmitters bind to receptors K+ gates Ca++ gates open Hyperpolarization Saltatory Release of Neurotransmitters Postsynaptic neuron Repolarization -55mV Na+ gates open Inhibitory...
Explain the difference between EPSP and IPSP. Which of the two will facilitate/inhibit a neuron? How do...
Explain the difference between EPSP and IPSP. Which of the two will facilitate/inhibit a neuron? How do these affect the firing rate of the postsynaptic neuron?
If a postsynaptic neuron has several excitatory and inhibitory synapses active at the same time, that...
If a postsynaptic neuron has several excitatory and inhibitory synapses active at the same time, that postsynaptic neuron __________ fire an action potential. For example, if we are looking a yellow object, both our red and green cones are activated; however, we do not perceive that object as red or green because the signals from the red and green cones to “green-on” and “red-on” ganglion cells will _________. In addition to multiple synapses affecting the likelihood of an action potential...
40. The effect of a neurotransmitter on a postsynaptic neuron is determined by the a. speed...
40. The effect of a neurotransmitter on a postsynaptic neuron is determined by the a. speed the action potential traveled down the axon b. number of branches of the presynaptic axon c. receptors on the postsynaptic membrane d. distance between the synapse and the cell body
Complete the following sentences regarding impulse processing. nuclei presynaptic neuron divergence postsynaptic neurons action potential convergence...
Complete the following sentences regarding impulse processing. nuclei presynaptic neuron divergence postsynaptic neurons action potential convergence neuronal pools facilitation 1. Neurons are organized into ____________ which can make multiple synaptic connections to receive and transmit information in the brain. 2. For example, any single neuron in the group may receive information from more than one ____________ . 3. This is called ____________ and makes it possible for impulses to have an additive effect or to collect a variety of sensory information. 4. An impulse from...
neuronal action potential reaches the axon terminal of neuron _______ are released from the axon terminal...
neuronal action potential reaches the axon terminal of neuron _______ are released from the axon terminal by ______ _______ diffuse across the _______ _______ and bind to ______ on the postsynaptic membrane of neuron, 2) generating an excitatory local potential, if the neuron is stimulated enough time, the excitatory local potentials _______ and spread through the neuron's plasma membrane toward the axon, when the trigger zone is deploarized to ______, an ______ is generated
Neuron Signaling and Muscle Contraction 1) “Dissect” the various parts of an action potential by describing...
Neuron Signaling and Muscle Contraction 1) “Dissect” the various parts of an action potential by describing the status (active or nonactive) of the voltage-gated sodium channel, voltage-gated potassium channel, sodium/potassium pump, and overall voltage and/ or voltage range (in millivolts, or mV) for each of the following. A) Resting membrane (prior to the initiation of an action potential) B) just before threshold to just after threshold (Depolarization) C) Rising phase of the action potential D) Falling phase of the action...
4. Draw a synapse between 2 neurons. Label the following: Presynaptic neuron, Postsynaptic neuron, Synaptic vesicles,...
4. Draw a synapse between 2 neurons. Label the following: Presynaptic neuron, Postsynaptic neuron, Synaptic vesicles, Voltage-regulated calcium channel, Chemical-regulated sodium channel. 5. Draw a diagram of the preganglionic neuron, postganglionic neuron, and effector for both Sympathetic Nervous System and Parasympathetic Nervous System. indicate which neurotransmitter is released by each neuron and label the receptors at all locations for the neurotransmitter. 6. Which cells have a resting membrane potential? Which cells can have an action potential? 7. Circle which of...
Fifteen different presynaptic neurons synapse on a single postsynaptic neuron. The postsynaptic neuron has a RMP of -70 mV. At the trigger zone, 14 of the presynaptic neurons produce excitatory postsynaptic potentials of 2 mV each, and the other one produces an inhibitory postsynaptic potential of 9 mV. The threshold for the postsynaptic neuron is -50 mV. Will action potentials be produced in the postsynaptic neuron? Is this an example of temporal summation or spatial summation? Explain your answers.
Action Potential Action Potential (AP) arises in presynaptic neuron Travels to Causes End of presynaptic neuron Leads to 2 Located in Excitatory Postsynaptic Potential begins at 6 Cl-gates open I s When Causing Depolarization to +30mV next opening 10 Nonmyelinated axons Myelinated axons Current spreads through each segment Current spreads by---- 11 Action Potential Word Bank ŠMU Auso Neurotransmitters bind to receptors K+ gates Ca++ gates open Hyperpolarization Saltatory Release of Neurotransmitters Postsynaptic neuron Repolarization -55mV Na+ gates open Inhibitory...
40. The effect of a neurotransmitter on a postsynaptic neuron is determined by the a. speed the action potential traveled down the axon b. number of branches of the presynaptic axon c. receptors on the postsynaptic membrane d. distance between the synapse and the cell body
4. Draw a synapse between 2 neurons. Label the following: Presynaptic neuron, Postsynaptic neuron, Synaptic vesicles, Voltage-regulated calcium channel, Chemical-regulated sodium channel. 5. Draw a diagram of the preganglionic neuron, postganglionic neuron, and effector for both Sympathetic Nervous System and Parasympathetic Nervous System. indicate which neurotransmitter is released by each neuron and label the receptors at all locations for the neurotransmitter. 6. Which cells have a resting membrane potential? Which cells can have an action potential? 7. Circle which of...
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