Question 4 5/ 6 points Marybeth uses a library of venomous toxins to test their influence on neuronal firing. Below is a a summary of the effects. Predict what type of change would occur to neuronal activity. You can put I for increase or D for decrease. Toxin 1 2 3 4 5 6 Drug Effect Blocks Voltage-gated Na+ channels Decreases the sensitivity of the voltage sensing component of a Na+ channel so it requires more of a positive potential. Increases the period of hyperpolarization Causes the Na+/K+ pump to be more effective at moving K+ into the cell resulting in reduced K+ extracellular levels. Causes the concentration gradient of Cl- to flip so that when Cl- channel open you get? Blocks passive leak channels for K+. Reducing the relative perameability of K+ at rest. Neuronal activity (increased or decreased)

Question 4 5/ 6 points Marybeth uses a library of venomous toxins to test their influence on neuronal firing. Below is a a summary of the effects. Predict what type of change would occur to neuronal activity. You can put I for increase or D for decrease. Toxin 1 2 3 4 5 6 Drug Effect Blocks Voltage-gated Na+ channels Decreases the sensitivity of the voltage sensing component of a Na+ channel so it requires more of a positive potential. Increases the period of hyperpolarization Causes the Na+/K+ pump to be more effective at moving K+ into the cell resulting in reduced K+ extracellular levels. Causes the concentration gradient of Cl- to flip so that when Cl- channel open you get? Blocks passive leak channels for K+. Reducing the relative perameability of K+ at rest. Neuronal activity (increased or decreased)

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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Question 28 After the depolarization phase of an action potential, the resting potential is restored by ___ A brief inhibition of the sodium-potassium pump The opening of more voltage-gated sodium channels O A decrease in the membrane's permeability to potassium and chloride ions O Voltage-gated potassium channels opening and sodium channels inactivating Question 29 80 F3 F4 F5 F7 FB
Question 77 In order to trigger an action potential, a local potential must be above this when it reaches the area just outside of the trigger zone adin resting membrane potential threshold synaptic cleft internode A Moving to another question will save this response. «< Question MacBook Air 888 F2 F3 DII FS F7 F8 F9 F10 23 24 & 2 3 4 7 W E RI T. Y U S G H. K C M mand command -の B DI
Question 7 Place the events involved in generating an action potential in the order in which they occur. 1. exocytosis of neurotransmitter 2. graded potential occurs 3. neurotransmitter binds receptor 4. Cat crosses membrane 5. Cat voltage gated channels open 6. neurotransmitter diffuses across cleft 7. action potential reaches axon terminal O 7.5.4.1.6.3.2. O 6.1.3.5.7.2.4. O2.6.7.5.4.1.3. O 5.7.3.4.1.2.6. < Previous
QUESTION 6 Short term facilitation may be due to: Increases in the amount of Na that enters the cell Short term increase in Ca due to previous firing of the synapse A decrease in the amount of K that exits the cell Depletion of the vesicles at the synaptic nerve terminus
QUESTION 23 Activating a muscarinic receptor coupled to which G protein would cause calcium to be released? Gs Gi Gq None of the above
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0.5 pts Question 8 One a reversal of charge happens at the membrane, voltage-gated Na+ channels are which helps to prevent an action potential from restarting until the action potential is complete.
Question 12 When a graded potential summates to threshold at the axon hillock, O ligand-gated Ca+2 channels close rapidly. O voltage-gated Ca+2 channels open rapidly. ligand-gated Na+ channels close rapidly. O voltage-gated Na+ channels open rapidly. O ligand-gated K+ channels open rapidly.
Question 9 During the absolute refractory period for a neuron, most voltage-gated Na+-channels are in which conformation? a. closed but capable of opening © b. open, or activated c. closed and not capable of opening d. Any of these.
Question 4 Place the following events in order of their occurrence. 1. membrane repolarizes 2. K+ voltage gated channels open 3. Na+ voltage gated channels close 4. threshold is reached 5. membrane depolarizes 6. Na+/K+ pump reestablishes resting potential 7. Na+ moves through non-gated channels 8. Na+ voltage gated channels open 9. hyperpolarization then closure of K+ gates 10. membrane depolarizes to peak O 7.5.4.8.10.3.2.1.9.6 O 5.9.4.3.10.1.2.8.6.7. O 3.7.9.5.10.6.4.2.1.8 O9.6.8.10.2.5.7.1.3.4.9. « Previous
QUESTION 19 What causes Process F to occur? NEURON X Axon terminal of a cholinergic neuron Substrate A Synthesis and packaging into a vesicle Neurotransmitter break down by Enzyme D Substrate B Process F 3 Protein E Substrate B transport into the axon terminal Receptor C 4 Substrate B is recycled to produce neurotransmitter Acetate Enzyme D NEURON Y Opening of voltage-gated potassium ion (K*) channels in the axon terminal increased reuptake activity of Protein E Increase in calcium ion (Ca-") concentration inside of the axon terminal after hyperpolarization of the neuronal cell membrane
QUESTION 14 Which statement is not correct? H C NEURON K NEURON L A G E LABEL H is the cell body LABEL M is pointing to a Node of Ranvier NEURON K is a myelinated neuron NEURON L is the presynaptic neuron