Name: ______Date: ______Hour:______

Nervous System Chapter 28 On-line Activities

28.1

1. What are the major components of the CNS?

2. What are the major components of the PNS?

3. How is a neuron (nerve cell) different from a nerve?

Page 2

1. Identify the three types of neurons shown.

2. Describe the roles of the sensory receptor, interneuron, and motor neuron in a knee jerk reaction

28.2

1. Compare and contrast the dendrites to an axon.

2. Describe how the Schwann cells form the myelin sheath.

3. How does the myelin sheath impact the speed of a nerve impulse?

Page 2

1. When the microelectrodes were inserted inside and outside the cell, the voltmeter registered –70 mV. What is the significance of this reading?

2. How do the Na+ and K+ ion channels relate to the movement of the ions?

3. What is the function of the Na+/K+ pump?

Page 3

  1. Describe the overall change in charge during the first step of an action potential.
  1. Once an action potential has passed through an area of the membrane, what happens to the charge inside the cell?
  1. How does an action potential sequence resemble a whole row of closely placed dominos that are tipped over? Explain.

Page 4

  1. What is the difference between a synapse and a synaptic cleft?
  1. What are the "chemicals" in a chemical synapse?
  1. Where are neurotransmitters stored in a resting neuron?
  1. What is the role of the protein receptor on the receiving cell?

28.3

1. If the sympathetic division stimulates the liver to release glucose into the bloodstream providing a source of energy, what do you think will happen in the liver when the parasympathetic division is active?

2. In general terms, describe the relationship between the sympathetic and parasympathetic nervous divisions.

28.4

1. Compare the role of the cerebrum and cerebellum.

2. A child sleeps soundly, even with loud traffic outside, but wakes instantly when the child's parent quietly walks into the room. Which region of the brain sorts this information and enhances the sounds of the parent entering the room?

3. You go to a movie, and you are bombarded with loud sound effects, vivid computer graphics, and the smell of fresh popcorn. What lobes of the cerebral cortex are involved?

Page 2

1. Playing tennis involves interactions among several parts of the brain. Refer to the activity above, and briefly explain the role that each of the following parts of the brain would play during a game of tennis.

a. brainstem

b. cerebellum

c. thalamus