Answered: A channel opens on a postsynaptic…

A channel opens on a postsynaptic membrane thatcauses a negative ion to enter the cell. What type of gradedpotential is this?a. depolarizingb. repolarizingc. hyperpolarizingd. non-polarizing

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter16: The Body's System

Section: Chapter Questions

Problem 24RQ: Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c....

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Concept explainers

Osmosis

In simple words, osmosis is the slow, gradual movement of a liquid through a membrane. But there are nuances to this process. For instance, there has to be an imbalance in the distribution of solute in the liquid on either side of the membrane, which has to be semipermeable. The liquid in the region with a lower solute concentration moves to the region with a higher concentration, thereby displacing the solution in the process. The objective is to equalize the concentration of molecules on both sides of the membrane; the displacement of liquid can be viewed as a byproduct of this equalization. Since there is no energy required to carry osmosis, it is considered a passive process.

Question

A channel opens on a postsynaptic membrane that
causes a negative ion to enter the cell. What type of graded
potential is this?
a. depolarizing
b. repolarizing
c. hyperpolarizing
d. non-polarizing

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Neurons contain ________, which can receive signals from other neurons. a. axons b. mitochondria c. dendrites d. Golgibodies
Assume presynaptic excitatory neuron A terminates on a postsynaptic cell near the axon hillock and presynaptic excitatory neuron B terminates on the same postsynaptic cell on a dendrite located on the side of the cell body opposite the axon hillock. Explain why rapid firing of presynaptic neuron A could bring the postsynaptic neuron to threshold through temporal summation, thus initiating an action potential, whereas firing of presynaptic neuron B at the same frequency and the same magnitude of EPSPs may not bring the postsynaptic neuron to threshold.
A channels opens a postsynaptic membrane that causes a negative ion to enter the cell. What type of graded potential is this?
An EPSP facilitates depolarization of the postsynaptic membrane by O increasing the permeability of the membrane to K+. O stimulating the Na+-K+ pump. O allowing Cl- to enter the cell. O increasing the permeability of the membrane to Na+. O insulating the hillock region of the axon.
Which of these terms is correctly matched with its definition ordescription?a. depolarization: membrane potential becomes more negativeb. hyperpolarization: membrane potential becomes more negativec. hypopolarization: membrane potential becomes more negative
During a relative refractory period of an action potential A. Another action potential can be fired, it just takes a greater stimulus for the membrane potential to reach threshold B. Na+ channels are either already open or are inactivated therefore the membrane absolutely can not produce another action potential, no matter how intense the stimulus C. Ca++ flows out of the cell, causing hyperpolarization and a need for a greater stimulus to generate the action potential D. The presynaptic neuron "tells" the postsynaptic neuron about the "relative" strength of signal E. None of the above are correct
If a neuron is stimulated simultaneously by 2 stimuli at its dendrites (one generates a very large hyperpolarizing potential and the other generates a very small depolarizing potential). What would happen to this neuron? Group of answer choices The summation of these two graded potentials will generate an action potential and this action potential will travel down the axon. Summation of these two graded potentials will cause the membrane potential at the axon hillock to be more negative. These graded potentials will bring the resting membrane potential to 0 mV. These graded potentials with opposite polarity would therefore generate two action potentials and they will travel along this neuron in opposite direction.
If a postsynaptic cell has synapses from five different cells, and three cause EPSPs and two of them cause IPSPs, give an example of a series of depolarizations and hyperpolarizations that would result in the neuron reaching threshold.
Each of the following is a correct relationship between action potential phase and channel status except Select one: O A. hyperpolarizing phase; K channels open O B. hyperpolarizing phase: Na channels open O C. depolarization: Na channels open OD.repolarizing phase: Na channels closed O E repolarizing phase: K channels open ch
Which of the following examples of synaptic integration is most likelyto lead to an action potential in a postsynaptic cell?a. All excitatory and no inhibitory synaptic inputsb. An equal mix of excitatory and inhibitory inputsc. A majority of inhibitory inputs with only a few excitatory inputsd. Both a and b are correct.
When ionotropic receptors allow the influx of ions, the postsynaptic cell depolarizes. When they allow the influx of ions, the postsynaptic cells get inhibited.
Resting potential is a balance across the axon membrane between______forces moving ions out of the cell and ______forces operating to keep ions in the cell.