Lab Report: Nervous System Lab Report: Brain & Special Senses

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Nervous System Lab Report

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The lab report is unique each semester and checks have been put into place to ensure students are doing their own work. Copying from other students or from outside sources will result in a zero on the accompanying lab quiz.

1. Neuron

1. The Central Nervous System consist of:
   

2. The Peripheral Nervous system consists of:
   
   

1. In Ex 1, observe the slides of the parts of a neuron and list the function of those parts from Step 1:

1. Exercise 1. Draw a reflex arc and label the following: sensory neuron, interneuron, motor neuron, stimulus, synapse, axon terminal, axon, dendrite, cell body, and effector. Sign, date, and prepare an image of your drawing and include with your lab report.

B. Classes of Neurons

1. Complete the table of three classes of neurons

1. Central Nervous System

1. Observe the cross section of the spinal cord and fill out the comparison table.

1. Ex 2, Steps 2-4 Follow the path of a reflex arc from stimulus to response.
   
   

1. Reflex

1. Of the following descriptions, highlight the feature that DOES NOT describe a reflex.

1. Simple involuntary response to a stimulus

2. Includes a receptor, sensory neuron, motor neuron and effector

3. It is the simplest functional unit of the nervous system that detects and responds to change

4. The effector can respond with varying degrees of intensity

5. A reflex is specific, involuntary, and repetitious

1. 1. Stretch or Tendon Reflex

1. In Ex 3, watch the video demonstration of steps 1-3, then describe what happens in the patellar tendon reflex.
   

1. 1. Pupillary Reflex

1. In Ex 4, go through Steps 1-3. You can do this with a partner or observe your own eyes through a mirror. Which is faster, constriction or dilation of the pupils?
   
   

1. 1. Complex Reflex

1. In Ex 5, follow the instructions in Step 1. Why is it impossible to swallow several times in quick succession?
   

1. Why is a reflex sometimes referred to as a “no brainer”?
   

1. Reaction

1. How are reactions different from reflexes?

1. In Ex 6, watch the video demonstration. Complete the exercise using a ruler and record your data below:

1. Was there a change in the reaction time during the ten trials? Explain.
   

1. Sensations

1. The smallest part of a sense organ that responds to stimuli is:
   

1. 1. Skin Receptors

1. Ex 7, observe the slides of the 5 skin receptors and complete the table:

1. 1. Modality

1. What are the 4 modalities tested in this experiment?
   
   

1. 1. Projection

1. Referred pain is when the pain is felt in a different area of the body from where the stimulus is. Give two examples.
   

1. 1. Adaptation

1. When the sensation to a stimulus gets less intense over time and the person may not even notice it is called:
   
   
   

2. Watch the video demonstration and follow steps for Lab Ex 10. Give a brief summary of results.
   
   

1. Ex 11, how many pennies can you stack on your arm before you feel it?
   

Summary Questions

1. Highlight the correct statement concerning the direction the action potential travels in a nerve cell?

   1. dendrites to cell body

   2. cell body to axon

   3. axon to axon terminals

   4. all of these are correct

1. Name some areas of the body that would have sensory neurons.
   

1. In the skin which of the 5 sensory receptor cells are not encapsulated and what sensations does it respond to?
   
   

1. Compare reflexes and reaction in the comparison chart

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1. Match the example to the type of sensation:

Modality ____ a. elbow in ice is felt in forearm and hand

Projection ____ b. you no longer feel the clothes on your body

Adaptation ____ c. specific stimuli trigger specific sensory receptors

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