Homework Answers
Alcohol mimic GABA and bind to GABA receptor which causes chloride ion channel to open for long time and chloride ion moves into the cell along with the concentration gradient . Thus neuron cannot fire an impulse. So option(B) is correct
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Alcohol binds to GABA receptors causes ion channels to open. This would A. Increase the likelihood...
1) Which ligand-gated ion channels does (glutamate / GABA / glycine) open? 2) How do changes...
1) Which ligand-gated ion channels does (glutamate / GABA / glycine) open? 2) How do changes in (potassium / sodium) concentration affect the resting membrane potential? 3) If (sodium / potassium / chloride) channels are locked open, the membrane potential will continue to change due to ion flow until it reaches what value? (give a numerical value)
You are studying a cell that contains ACh-activated GIRK channels. Which of the following dimers would...
You are studying a cell that contains ACh-activated GIRK channels. Which of the following dimers would increase the ability of the cell to fire action potentials in the presence of ACh, and why? a. β-γ dimer, becasue this dimer decreases the amount of open GIRK channels in the cell and therefore reduces their hyperpolarizing effect on the cell, increasing its ability to fire an action potential. b. α-GDP dimer, because this dimer would bind to the β-γ dimer leading to...
An ion channel inhibitor is discovered which selectively targets potassium ion voltage-gated channels. Which of the...
An ion channel inhibitor is discovered which selectively targets potassium ion voltage-gated channels. Which of the following effects would this inhibitor most likely have on neurons? and here are the answer choices, A. Decrease in the sensitivity of action potential generation B. Increase of the resting potential of the cell to 0 mV C. Inhibition of repolarization after an action potential D. Inhibition of action potential depolarization
B C). F Fotch G I Anind A [Choose) B [Choose ] Acetyl-choline gated sodium channels...
B C). F Fotch G I Anind A [Choose) B [Choose ] Acetyl-choline gated sodium channels open, causing a graded potential on the sarcolemma An action potential moves across the sarcolemma and down the t-tubules An action potential arrives in the muscle cell via gap junctions The calcium ATPase is always active Ca++ is released from the sarcoplasmic reticulum through the opening of voltage gated calcium channels (DHP- Calcium diffuses through the cytosol and binds with troponin Acetylcholine binds with...
QUESTION 42 The amino acid GABA is a commonly used neurotransmitter in the nervous system. If...
QUESTION 42 The amino acid GABA is a commonly used neurotransmitter in the nervous system. If GABA were to bind directly to receptors and open chloride channels in an early developing neuron that had 100 mM chloride in the cytoplasm and 100 mM chloride in the extracellular fluid, the release of GABA from a presynaptic neuron would . hyperpolarize the post-synaptic cell and inhibit the production of action potentials in the post-synaptic cell lead to no change in the voltage...
16. Which of the following explains the action of Epinephrine at the SA node? a) It...
16. Which of the following explains the action of Epinephrine at the SA node? a) It binds to Beta 1 receptors on the SA node increasing the strength of cardiac muscle contraction b) It binds to muscarinic receptors on the SA node prolonging repolarization c) It binds to beta 1 receptors on the SA node causing rapid opening of HCN causing the membrane increasing the frequency of action potentials 17. Which of the following describes the action of a cholinergic...
In a resting neuron, ion channels for the diffusion of____are typically open, while those that allow____to...
In a resting neuron, ion channels for the diffusion of____are typically open, while those that allow____to pass are typical closed. Name the two membrane proteins that help to set up and maintain the resting membrane potential of a neuron. With respect to membrane channels and ions, what causes a neuron to become depolarized? After depolarization, with respect to membrane channels and ions, what causes a neuron to repolarize?
n5 Match the ion channels to the functions. answered out of 5 What causes exocytose at...
n5 Match the ion channels to the functions. answered out of 5 What causes exocytose at the Choose... axon terminal? g question What causes hyperpolarization Choose... in a resting neuron? What causes hyperpolarization Choose Choose... following repolarization? What causes an excitatory graded potential? Choose... What action serves as a second messenger? Choose... Hair cells Speciale Slide 14 of 70 Er
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivati...
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivation. However, opening of the voltage-gated K channels lags behind opening of the voltage-gated Na channels. a) Why does neuronal function require the voltage-gated K channels to open more slowly than the voltage-gated Na channels? b) Compared to a neuron that lacks voltage-gated K channels, what differences would you expect in the shape...
INFORMATION ABOUT IMAGE G FOR QUESTIONS 12-15: GABAB receptors (GABABRs) are G-protein-coupled receptors that can be...
INFORMATION ABOUT IMAGE G FOR QUESTIONS 12-15:
GABAB receptors (GABABRs) are
G-protein-coupled receptors that can be found on both pre- and
postsynaptic neurons. When they are activated by GABA, they can
have a range of effects. For the synapse you are studying in the
following questions, the effects of GABABRs are
indicated in IMAGE G.
You are doing a series of experiments in which you are recording
from the pre- and postsynaptic cell at a synapse. The experiments
described below...
B C). F Fotch G I Anind A [Choose) B [Choose ] Acetyl-choline gated sodium channels open, causing a graded potential on the sarcolemma An action potential moves across the sarcolemma and down the t-tubules An action potential arrives in the muscle cell via gap junctions The calcium ATPase is always active Ca++ is released from the sarcoplasmic reticulum through the opening of voltage gated calcium channels (DHP- Calcium diffuses through the cytosol and binds with troponin Acetylcholine binds with...
QUESTION 42 The amino acid GABA is a commonly used neurotransmitter in the nervous system. If GABA were to bind directly to receptors and open chloride channels in an early developing neuron that had 100 mM chloride in the cytoplasm and 100 mM chloride in the extracellular fluid, the release of GABA from a presynaptic neuron would . hyperpolarize the post-synaptic cell and inhibit the production of action potentials in the post-synaptic cell lead to no change in the voltage...
In a resting neuron, ion channels for the diffusion of____are typically open, while those that allow____to pass are typical closed. Name the two membrane proteins that help to set up and maintain the resting membrane potential of a neuron. With respect to membrane channels and ions, what causes a neuron to become depolarized? After depolarization, with respect to membrane channels and ions, what causes a neuron to repolarize?
n5 Match the ion channels to the functions. answered out of 5 What causes exocytose at the Choose... axon terminal? g question What causes hyperpolarization Choose... in a resting neuron? What causes hyperpolarization Choose Choose... following repolarization? What causes an excitatory graded potential? Choose... What action serves as a second messenger? Choose... Hair cells Speciale Slide 14 of 70 Er
3. Many neurons contain "delayed K channels". Like voltage-gated Nat channels, these voltage-gated K+ channels open in response to a rise in membrane potential and then undergo inactivation. However, opening of the voltage-gated K channels lags behind opening of the voltage-gated Na channels. a) Why does neuronal function require the voltage-gated K channels to open more slowly than the voltage-gated Na channels? b) Compared to a neuron that lacks voltage-gated K channels, what differences would you expect in the shape...
INFORMATION ABOUT IMAGE G FOR QUESTIONS 12-15:
GABAB receptors (GABABRs) are
G-protein-coupled receptors that can be found on both pre- and
postsynaptic neurons. When they are activated by GABA, they can
have a range of effects. For the synapse you are studying in the
following questions, the effects of GABABRs are
indicated in IMAGE G.
You are doing a series of experiments in which you are recording
from the pre- and postsynaptic cell at a synapse. The experiments
described below...
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