Which of the following best explains why some ion channel mutations cause epilepsy? They make neurons more resistant to depolarization They block neurotransmitter release entirely They increase the threshold required for action potential firing They cause excessive or prolonged neuronal firing due to altered ion flow
Added by Brendan G.
Close
Step 1
This can be caused by a variety of factors, including genetic mutations that affect ion channels. Show more…
Show all steps
Your feedback will help us improve your experience
Adi S and 76 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Which of the following is required for the secretion of neurotransmitters in response to an action potential? neurotransmitter receptors Na-K pumps voltage-gated Ca2+ channels voltage-gated channels Which of the following is NOT true about an action potential? They are self-propagating and amplifying. The initial stimulus must be above the threshold level. They result in depolarization of the cell. They only move in one direction down an axon. Which of the following would inhibit a cell from firing an action potential? Opening of Cl- channels. Inactivation of K+ leak channels. Binding of acetylcholine. Opening of Ca2+ channels. Suppose that a disorder caused an increase in Na+ in the extracellular fluid surrounding your neurons. What effect, if any, would this have on the neuron? It would be more likely to fire an action potential. It would have a more positive action potential peak. It would use less energy to drive the Na+/K+ pump. There would be no effect.
Adi S.
A drug that does which of the following could generate IPSPs and therefore interfere with normal neuronal communication in the adult brain? a. increases the permeability of the postsynaptic membrane to Na+ b. decreases the permeability of the postsynaptic membrane to Cl- c. blocks all voltage-gated ion channels. d. blocks voltage-gated ion channels that allow the flow of negatively charged ions e. increases the permeability of the postsynaptic membrane to K+ 2. Action Potentials do not travel towards the soma of the neuron but only down the axon (towards axon terminals). Which of the following explains this phenomenon? a. myelin is found only on axons, not the soma b. the entire neuron is not negative inside, the neuron is at -70mV only along the axon c. soma of neurons typically receive IPSPs, while the axons typically receive EPSPs d. ligand-gated ion channels are only found at the axon hillock and Nodes of Ranvier e. voltage-gated Na+ channels are largely not found on the membrane of the soma 3. Colorful marine snails called cone snails produce venom that can kill a human in as little as 4 minutes. The venom contains a chemical that blocks Ca2+ channels operated by changes to the membrane potential. This chemical shuts down neuronal communication by: a. preventing neurotransmitters from being produced b. forgetting some glutamate receptors from working properly c. preventing the release of neurotransmitters at the synapse d. preventing voltage-gated Na+ channels from opening e. causing neurons to experience IPSPs, thus resulting in hyperpolarization of the neuron 4. At an excitatory synapse that uses glutamate as the neurotransmitter and ionotropic glutamate receptors, which of the following ion(s) is(are) transported through both ligand and voltage-gated ion channels? a. Cl- b. Na+ c. Ca2+ d. glutamate e. both "b" and "c" are correct
Jorge V.
Significantly increasing the calcium concentration in the extracellular fluid surrounding a neuron would cause the membrane to depolarize. This would initially trigger some action potential as the membrane exceeds the threshold potential, but ultimately it would stop all action potentials.
Madhur L.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD