Project #47997 - Nervous tissue

 I just gave birth and my kid is not in a good condition so we're still in the hospital. I have a homework due at 9pm tomorrow Pacific time. I know it's kind of late already. I just thought i can make it home today and work on it but i didnt. I hope u guys can help me.

 

Introduction to Membrane Potentials

 

1.​Describe the neuron function.  â€‹

 

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2.​Contrast graded potentials and action potentials.​

 

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3.​a. Describe how there can be an electrical change on either side of a membrane thereby generating amembrane potential.

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​b. What two characteristics must a membrane possess in order to generate and maintain electrical signals critical to nervous tissue?

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Membrane Transport Proteins

 

4.​What three membrane proteins are required if a membrane is to carry electrical impulses?

 

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5.​Describe the activity of sodium and potassium ion channels.​

 

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6.​How do the following differentially affect gated channels?

Chemicals (ligands)
Voltage changes
Mechanical deformation

 

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7.​Where are each of the following types of gated channels located AND what type of function do they serve?

 

​Ligand gated - â€‹

 

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​Voltage gated - â€‹

 

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​Mechanically gated - â€‹

 

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8.​a. Describe the function of the Sodium/Potassium pump. â€‹

 

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b. How does the sodium/potassium pump action maintain the membrane potential?

 

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Resting Membrane Potentials

 

9.​Describe the positive and negative charges on either side of a membrane at resting potential.

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10.​a. The opposite “poles” of a battery are positively and negatively charged.  Explain why polarized is a good term to describe a membrane with a resting potential.

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​b.​Where, exactly, do the opposing charges exist?  What is the charge of the cytosol and the extracellular fluid?

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​c.​What is the typical resting potential for a membrane?​

 

 

11.​Describe how the following contribute to the unequal distribution of ions and charges thereby establishing a resting membrane potential.

 

​K+ permeability - â€‹

 

​Na+/K+ Pump Activity - â€‹

 

 

 

 

Graded Potentials

 

12.​Define a graded potential​

 

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13.​How does opening a gated ion channel affect resting membrane potential?

 

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14.​Correlate the name “graded potential” to the affect of stimulus intensity. â€‹

 

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15.​Describe two types of graded potential change. 

 

​hyperpolarization - â€‹

 

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​depolarization - â€‹

 

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16. What is the role of graded potentials? â€‹

 

 

 

 

 

 

Action Potentials

 

17.​What is the function of a neuron’s trigger zone​

 

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18.​a.​Why are Na+ and K+ gated channels essential for an action potential? â€‹

 

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b.​Describe the electrical change during an action potential.​

 

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19.​a.​What is the condition of the Na+ gated channels at resting potential? â€‹

 

​b.​Explain the importance of stimulus strength. â€‹

 

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​c.​What effect does hyperpolarization or depolarization less than -55 mV have on Na+ gated channels?

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​d.​Explain why an action potential is sometimes referred to as an “all or nothing” response. 

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​e.​Reversal of the membrane charge closes the Na+ gates and opens the K+ gates.  How does this affect the depolarization?   Include the role of the Na+/ K+ pump in your response.

 

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20.​Describe the refractory period​

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Subject Science
Due By (Pacific Time) 11/18/2014 06:00 pm
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