Lesson 1.1.1

1.1.1 page 2

Explore

 


Watch and Listen

View the BiologiX 1 video “Electrochemical Control Systems in Humans:Regulating Physiological Process.”

 

central nervous system (CNS): the part of the nervous system that includes the brain and spinal cord

peripheral nervous system (PNS): the portion of the nervous system consisting of nerves and ganglia (collections of nerve cell bodies) that are outside the brain and spinal cord

neuron: the basic functional cell of the nervous system that is specialized to generate and transmit nerve impulses (messages)

nerve: message pathway of the nervous system; made up of many neurons grouped into bundles and surrounded by protective tissue; there are 12 pairs of cranial nerves that insert into the brain and 31 pairs of spinal nerves that emanate from the spinal cord

This video presents the two divisions of the nervous system. These are the central nervous system, composed of the brain and the spinal cord, and the peripheral nervous system. Watch for the divisions of the peripheral system and how they control the body consciously and unconsciously. This video demonstrates communication and homeostasis. The video also explains the structures of the neuron, which is a basic building block of the nervous system, and outlines how neurons aid communication.

 

“Electrochemical Control Systems in Humans: Regulating Physiological Process” also examines the organization of nerves and shows how nerves network to support communication. As you explore typical communication, keep in mind what could result when interruptions occur in, for example, multiple sclerosis and Alzheimer’s disease.

 

Read

This is an illustration of the human nervous system.

The video provides a good foundation on the various parts of the nervous system and how they work. You may wish to read pages 366 to 369 in your textbook and make summary notes for your course folder to increase your understanding of the nervous system.



Try This

autonomic nervous system (ANS): a division of the peripheral nervous system that conducts nerve impulses to cardiac and smooth muscles, as well as to glands; may also be called the involuntary motor system

somatic nervous system (SNS): a division of the peripheral nervous system that conducts nerve messages to the skeletal muscles; may sometimes be called the voluntary nervous system

TR. In both the video and the reading, the divisions of the nervous system including the autonomic nervous system and the somatic nervous system were presented as being vital towards maintaining homeostasis.

This is your opportunity to practice your understanding of the autonomic and somatic nervous systems and how they communicate to maintain balance.

You can revisit the video or the reading if you need to review these systems.

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