What is the nervous system?
A rapid communication system connecting all organs through nerve fibers.
What protects the nerve centers?
Three membranes called the meninges.
What is a neuron?
An excitable, stimulable, and information-conducting cell.
How many neurons and glial cells are in the human encephalon?
About 100 billion neurons and 20 times more glial cells.
Nervous system definition - ENGLISH
Rapid communication system linking organs
Encephalon components - ENGLISH
Brain, brainstem, cerebellum
Types of nerves - ENGLISH
Sensory, motor, or mixed; 12 cranial, 31 spinal pairs
Nerve protection membranes - ENGLISH
Meninges (three layers) protect nerves
Neuron structure - ENGLISH
Dendrites, cell body, axon, myelin sheath, terminals
Glial cells - ENGLISH
Support, nourish, and protect neurons
Reflex behavior - ENGLISH
Involuntary movement response to stimulus
Answer 7 questions on Reflex Behaviors and Nervous System.
1. What is the primary role of the nervous system in the body?
2. Which structures together constitute the nerve centers of the nervous system?
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