Module 1 The Nervous System

1.1.7 page 4

Self-Check

TR 1. One way to model the action potential is to line up several dominoes and initiate a cascade event, in which each successive domino knocks down the next domino.

1.  In this model, the hand provides the initial energy. What provides the initial energy in a neural impulse?

2. The finger has to contact the first domino just hard enough to get it to fall. Which response does this represent in a real neuron?

3. Once the dominoes start to fall, they all fall in succession. What does this action represent in the real neuron?

4. The dominoes always fall in one direction. Contrast this with the direction of impulse transmission in a real neuron.

5. No matter how many times the dominos fall, they always move at the same speed and intensity. What principle does this represent in the real neuron?

Check your answers before proceeding further in this lesson.

 

 

Self-Check

After reading the text, watching the animations, and comparing a nerve impulse to the falling of dominoes, do you feel confident that you understand and can explain the changes that are involved in the transmission of a nerve impulse? Complete this next activity without consulting any references. Check your answers, make corrections and/or additions and file these handouts in your Biology 30 Course Folder for easy access when studying.

 

Depolarization of the Neuron Handout

Inquiry into Biology (Whitby, ON: McGraw-Hill Ryerson, 2007), BLM 11.1.9. Reproduced by permission.

 

1. What is illustrated by Number 1? Explain what is happening in Number 1.
   
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2. What is shown by Number 2? Explain what is happening to Number 2 at this time.
   
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3. What is indicated by Number 3? Identify one characteristic of Number 3 and identify the function of Number 3.
   
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4. What structure is shown by Number 4? Explain its function.
   
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5. What are 5 and 6? What is their function in nerve impulse transmission?
   
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Repolarization of the Neuron Handout

Inquiry into Biology (Whitby, ON: McGraw-Hill Ryerson, 2007), BLM 11.1.9. Reproduced by permission.

 

1. What is shown by Number 1 in this diagram? How do you know this?
   
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2. What is happening in Number 2 in this process?
   
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3. What is the function of Structure 3?
   
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4. What functions does Structure 4 serve in the process illustrated?
   
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5. What do 5 and 6 tell you about Structure 4?
   

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If your answers are similar to those in the self check key, you are ready to submit an assignment to your teacher to show your understanding. If you do not understand the concepts, then you need to access your teacher for further discussion before attempting the assignment.