Question 18 of 18Leak ion channelsSelect the correct response:open in response to small voltage changes.open when a chemical signal binds to its receptor.are responsible for the ion permeability of the resting plasma membrane.Allow substances to move into the cell but not out.All of these are correct.

Leaky channels are those which are not regulated by the potential change in the membrane, so, any…

Answered: Leak ion channels Select the correct…

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

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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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How is the cell membrane like a battery? Membrane potential (think of the properties of a battery) Resting membrane potential Na+ and K+ ions -> -70 mV Na+/K+ pump Stored energy for work
Describe the events of an action potential in terms of ions and gates or channels beginning with the generation of a local potential through the re-establishment of resting membrane potential.
If the resting membrane potential of a cell was +70 mV, the ELECTRICAL driving force on sodium would be: Group of answer choices into the neuron out of the neuron balanced
The membrane of a neuron is vital to its ability to respond to signals from other neurons. Which of the following statements about this membrane is NOT accurate It ensures that the interior of the cell has a slightly positive charge at rest. It is selectively permeable, allowing ions to move in and out of the cell. It contains different types of specialized protein ion channels. It is made of two layers of lipids (fat molecules)
Place the following events in chronological order from 1-8: Nat enters the cell, and depolarization occurs to approximately +30 mV. The voltage across the cell membrane is -70 mV, the resting membrane potential. Upon reaching the peak of the action potential, the VG Nat channels are inactivated by the closing of their inactivation gate and the activation gate of each VG K channel opens. VG K channels close by the closing of their activation gate, and the resting membrane potential is gradually restored. An excitatory post-synaptic potential depolarizes the membrane to threshold and the activation gate of VG Nat channels open. Upon returning to the resting membrane potential, VG Na channels are reset by opening of the inactivation gate and the closing of the activation gate. VG K+ channels are slow to close, resulting in an excess of K* efflux and hyperpolarization. Depolarization occurs as K+ flows out of the cell.
Binding of acetylcholine to postsynaptic membranes increases the conductance of Na+ into the cell. It is an example of Group of answer choices active transport voltage-gated channel ligand-gated channel passive transport symporter
A change in membrane potential which is due to ion influx or efflux in a single region with the ions then diffusing away from that region is called a(n) ______
There are differences in Na+, K+, and Cl- ion concentrations across the membrane. Knowing that ions like to flow down their respective concentration gradients explain how the movement of Cl- and K+ ions can result in membrane hyperpolarization.
In excitable cells, such as neurons, K+ is held at a much higher concentration inside the cell than outside. Which of the following would hold K+ at this concentration?
Which of the following statements is false? ○ Voltage, stretch, and temperature are all factors that regulate the opening of ions channels The whole cell current (macroscopic current) can be calculated by summing the many microscopic single channel currents It is not possible to predict the precise moment that a channel will be open or closed, only the probability that opening or closing will occur Changing the concentration gradient of an ion will cause an ion channel to open
Match each type of membrane potential (resting, threshold, graded, or action) to its definition: a) The membrane potential at which voltage gated sodium channels open. b) The membrane potential that triggers the action potential. c) Change in membrane potential that may or may not reach threshold and that may be depolarizing or hyperpolarizing. d) Rapid, strong depolarization followed by immediate repolarization. This potential is self-renewing if the right ion channels are nearby.
Fill in the diagram, your illustration should demonstrate for each phase of the AP: 1. The relative concentration of K and Na 2. The relative voltage across the membrane 3. Any movement across the membrane of K and NA 4. The three kinds of channels in the membrane, and their state (open or closed) 5. Finally, indicate on the graph of the AP which phases correspond to hyper- polarization and which phases correspond to de- polarization Outside Outside Inside Inside Outside Inside Outside 1 Outside Inside Inside

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Leak ion channels Select the correct response: open in response to small voltage changes. open when a chemical signal binds to its receptor. are responsible for the ion permeability of the resting plasma membrane. Allow substances to move into the cell but not out. All of these are correct.