• The nervous system contains cells called neurons, which are specialized to carry nerve impulses.
  
  
• A nerve impulse is an electrochemical change that travels along the length of a neuron axon.
  
  
• Transmission of signals between neurons is dependent on neurotransmitter molecules.

1. What are the two major divisions of the nervous system?
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2. What are the three parts of a neuron and the three classes of neurons?
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3. What is a nerve impulse?
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4. Since neurons don't physically touch, how is an impulse transmitted from one neuron to another?
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• Nervous Tissue
• Action Potential

Animation Activity

• Action Potential
• Development of Membrane Potential

Art Labeling Activity

• Synapse Structure and Function (42.0K)

Art Quiz

• Sodium-Potassium Pump
• Myelin Sheath Formation

• The central nervous system is made up of the spinal cord and the brain.
  
  
• The spinal cord transmits messages to and from the brain and coordinates reflex responses.
  
  
• The parts of the brain are specialized for particular functions.
  
  
• The cerebral cortex contains motor areas, sensory areas, and association areas that communicate with each other.
  
  
• The reticular formation contains fibers that arouse the brain when they are active and account for sleep when they are inactive.

1. What structures compose the central nervous system?
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2. What are two functions of the spinal cord?
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3. What are four major parts of the brain and the general function of each?
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4. What brain structure is responsible for a person being awake and alert, asleep, or comatose?
   Answer

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• Central Nervous System

Art Labeling Activity

• Spinal Cord Anatomy I (36.0K)
• Spinal Cord Anatomy II (72.0K)
• The Human Brain (58.0K)

• The limbic system contains cortical and subcortical areas that are involved in higher mental functions and emotional responses.
  
  
• Long-term memory depends upon association areas that are in contact with the limbic system.
  
  
• Particular areas in the left hemisphere are involved in language and speech.

1. What is the function of the limbic system?
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2. What limbic structures are involved in learning and long-term memory?
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3. What areas of the cerebrum are involved with language and speech? Where are they located?
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• Limbic System

• The peripheral nervous system contains nerves that conduct nerve impulses toward and away from the central nervous system.

1. How many cranial nerves are there? How many spinal nerves are there?
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2. What is the fastest way for you to react to a stimulus?
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3. What is the autonomic system, and how does it function?
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• Peripheral Nervous System

Animation Activity

• Reflex Arc

• The use of psychoactive drugs, such as alcohol, nicotine, cocaine, heroin, and marijuana, is detrimental to the body.

1. How can the abuse of drugs, including alcohol, affect the nervous system?
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• Got Marijuana?

• The nervous system works with the other systems of the body, particularly the endocrine system, to maintain homeostasis.

1. How does the nervous system work with other systems of the body to maintain homeostasis?
   Answer