Help please Intracellularconcentration (mM)IonExtracellularBased upon these physiological concentrations and a normal resting potential, which of the followingchannel openings would result in a hyperpolarizing graded potential? (select all that apply - youmust select all correct answers to be considered correct).concentration (mM)NaK*CICaMgHCO,Nonpenetrating151421504120100.527A larger image can be found here (make sure to open in new tab):https://docs.google.com/presentation/d/1Hjl6xRvear0OUIBHOT1ohEBI315h6fo-oxrzOqlYooA/edit?usp=sharing155anionsQ ZoomABicarbonate channelsBChloride channelsCalcium channelsDSodium channelsEPotassium channelsFMagnesium channels

In animal cells, the plasma membrane expresses a different types of ion channels and pump which…

Answered: concentration (mM) concentration (mM)…

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter4: Principles Of Neural And Hormonal Communication

Section: Chapter Questions

Problem 17RE

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Voltage-gated Na+ channels open upon leaching what state? resting potential threshold repolaiization overshoot
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.
Which of the following voltages would most likely be measured during the relative refractory period? +30 mV 0 mV -45 mV -80 mv
Answer the following questions regarding conduction of action potentials using the velocities given on p. 100: a. How long would it take for an action potential to travel 0.6 m along the axon of an unmyelinated neuron of the digestive tract? b. How long would it take for an action potential to travel the same distance along the axon of a large myelinated neuron innervating a skeletal muscle? c. Suppose there were two synapses in a 0.6 m nerve tract and the delay at each synapse is 1 msec. How long would it take an action potential and chemical signal to travel the 0.6 m now, for both the myelinated and unmyelinated neurons? d. What if there were five synapses?
Conformational changes in channel proteins brought about by voltage changes are responsible for opening and closing Na+ and K+ gates during the generation of an action potential. (True or false?)
Muscle Contraction In an experiment, the strength of a neural stimulus and the resulting muscle contraction are compared. A single motor neuron that synapses with one muscle ﬁber is observed in this experiment. One end of the muscle ﬁber is attached to a mass. The following data was obtained from the experiment. *attached document is chart with data 1. Does the data in the table provide sufficient evidence of the value for the threshold potential? Why or why not 2.a) A student remarked that at 180 mV of stimulus, it is expected that 100 g mass is lifted by the muscle fiber.b)Do you agree or disagree? Why or why not? 3.Identify the manipulated, responding and controlled variables in the experiment described above a) strength of stimulus ________ (manipulated, responding, or controlled) b) number of mucsle fibre stimulated _____ (maniuplated, repsonding, or controlled) c) mass lifted by muscle contraction ______ (manipulated, responding or controlled) 4. How would you modify this…
At the peak of the action potential, Vm is approximately -65 mV. Assuming normal intracellular and extracellular K+ concentrations (refer to the table), (1) calculate the driving force (in mV) that acts on K+ ions and (2) use the information obtained in part 1 to determine the direction in which K+ ions will flow (i.e., into the cell or out of cell)
Suppose you placed an isolated neuron in a solution similar toextracellular fluid and later transferred the neuron to a solution lackingany sodium ions. What change would you expect in the resting potential?
match the listed events to note if they would, or would not, occur in a neuron under the effects of tetrodotoxin. the cell has a resting membrane potential of -65mV. You should match these events at the initial segment of a bipolar neuron, **Answer choice for all ( would occur, would not occur)
Describe the ion concentration gradients across the plasmamembrane of a neuron at resting potential.
At resting membrane potential for a typical neuron (-70 mV), which ion does NOT move?Na+Ca2+K+Cl-None
Neurons have a resting membrane potential of ___________________. varying votage as type and composition of channels can differ between neurons. theoretically the same votage because the ionic concentration is the same extracellularly and intracellularly for all neurons. equal to the equillibrium potential for potassium. directly opposing the equillibrium potential for sodium.

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