Nervous System
The nervous system is the way the body transmits information from the senses and the outside world to the brain, and back. The human nervous system consists of the brain, spine, and the nerves.
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What is the difference between the central nervous system and the peripheral nervous system?
The peripheral nervous system (PNS) consists of the nerves an...
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What are the functions of the nervous system?
The nervous system is the major controlling, regulatory, and ...
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What are the nerves of the peripheral nervous system?
There are two types of cells in the peripheral nervous system...
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What are The cells of the nervous system?
Nervous tissue is composed of two main cell types: neurons an...
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Does the nervous system consist of the brain?
The central nervous system is divided into two parts: the bra...
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What does the nervous system do?
The brain is a central computer, and the nervous system is a ...
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How does the nervous system work?
The nervous system is like a network that relays messages fro...
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What are the parts of the clam's nervous system?
The clam's nervous system is comprised of 3 pairs of ganglia ...
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What are the three functions of the nervous system?
Sensory neurons receive information, interneurons transfer an...
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Huntington's Disease affects men as well as women, often stri...
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What role does the nervous system play in maintaining homeostasis?
The nervous system maintains homeostasis by controlling and r...
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What are the two functional divisions of the nervous system?
The nervous system is divided into the central nervous system...
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Do "mixed nerves" of the peripheral nervous system contain both sensory and motor fibers?
Yes, the term mixed nerves in the peripheral nervous system d...
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What parts of the nervous system are involved in reflex actions?
The central nervous system and peripheral nervous system are ...
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What is the sympathetic nervous system? MORE?
The part of the autonomic nervous system originating in the t...
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What makes up the peripheral nervous system?
The peripheral nervous system consists of sensory neurons run...
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How is the central nervous system protected from injury?
There are three tough envelopes called meninges surround your...
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What is is the function of the nervous system?
The Nervous System is the center of all mental activity inclu...
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What is the autonomic nervous system and what does it do?
(ANS) is the part of the peripheral nervous system that acts ...
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What does the nervous system do?
The brain is a central computer, and the nervous system is a ...
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What is is the function of the nervous system?
The Nervous System is the center of all mental activity inclu...
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What is a somatic nervous system?
The part of the nervous system that controls voluntary moveme...
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What are the functions of the nervous system?
The nervous system is the major controlling, regulatory, and ...
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What is the function of the central nervous system?
The nervous system informs the body about itself and the worl...
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What does the nervous system do?
The brain is a central computer, and the nervous system is a ...
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What is the autonomic nervous system and what does it do?
(ANS) is the part of the peripheral nervous system that acts ...
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How is the central nervous system protected from injury?
There are three tough envelopes called meninges surround your...
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What does the nervous system do?
The brain is a central computer, and the nervous system is a ...
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What does xppx mean with the nervous system?
XPPX is an unknown protein that binds to fortilin. This is a ...
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How many nervous systems are found in the human body?
The human nervous system consists of both the central and per...
About Nervous System
What is the Nervous System?
The nervous system is often divided into the central nervous system (or CNS) and the peripheral nervous system (or PNS). The CNS is made up of the brain and the spinal cord. The PNS is made up of all other nerves and neurons that do not lie within the central nervous system. The large majority of what are commonly called nerves is considered to be a part of the peripheral nervous system. The peripheral nervous system is divided further into the somatic nervous system and into the autonomic nervous system.
The somatic nervous system is responsible for the coordination of the body's movements, and for also receiving external stimuli. It is this system that regulates activities that are under conscious control.
The autonomic nervous system, comprises the sympathetic division, parasympathetic division, and enteric division. The sympathetic nervous system responds to impending dangers or stress, and is responsible for the increase of the heartbeat and the blood pressure, among other physiological changes, along with the sense of excitement one feels due to the increase of adrenaline in the system.
The parasympathetic nervous system, is evident when a person is resting and feels relaxed, and is responsible for such things as the constriction of the pupil, the slowing of the heart, the dilation of the blood vessels, and the stimulation of the digestive and genitourinary systems. The role of the enteric nervous system is to manage every phase of digestion, from the esophagus to the stomach, small intestine, and colon.
There are three essential parts of the human nervous system. These include the brain, the spine, and the nerves. The brain is comprised of three main parts that interact with the nervous system: The cerebrum, the cerebellum, and the medulla. The cerebrum's tasks include high order thinking and learning, while the cerebellum manages learned automatic bodily functions, such as walking, jumping, and running. The medulla processes simple body functions, including breathing and digestion.
Reflex reaction occur independent of the brain with the spinal cord being the center of the response. Split second reflex decisions do not involve sensory nerve impulses traveling to the brain and then back to the organ or body part.
This would take too long and the nerve impulse would arrive too late to prevent the stimulus from becoming a reality. For example, if a ball were thrown at an individual's head, the reflex to move out of the way would come from the spine, not the brain, thus improving reaction time. The spine is also the highway which passes orders from the brain to the motor nerves.
There are four kinds of nerves: Motor, sensory, afferent, and interneurons. Any messages carried in any of these nerve types travels in only one direction.
Created by vickiz
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