The Nervous System Essay

768 Words 4 Pages
The Nervous System

Sensory neurones receive stimuli from sensory organ and receptors, which transmit the impulse to the spinal cord and the brain. Sensations transmitted by sensory neurone include heat, cold, pain, taste, smell, sight and hearing.

Motor neurones conduct impulses away from the central nervous system (the brain and the spinal cord) to muscles and glands in order to stimulate them into carrying out their activities.

2. Describe how a motor impulse moves a muscle. (Include details of an action potential).

When a neurone is stimulated maybe by light or sound the permeability of the cell membrane, to sodium ions, changes. Specific sodium gates or channels open and the Na
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Sound and light are appreciated so that the recipient of the stimuli can respond and adapt to the environment in the most appropriate way. The brain also co-ordinates bodily activities to ensure efficient operation and stores information so that behaviour can be modified as a result of experience.

4. Describe the autonomic nervous system.

The autonomic nervous system controls automatic functions of the body. These include controlling most glands. The heart and the organs are controlled by the action of involuntary muscles such as the bronchi, stomach arteries and intestines.

There are two parts to the autonomic nervous system, the sympathetic and the para-sympathetic system.

These both work in an opposite way of each other. E.g. the stimulation the sympathetic system increases heart rate and the para-sympathetic decreases the heart rate. The sympathetic system mainly uses the neuro-transmitter adrenaline while the para-sympathetic system acts through the chemical acetylcholine.

5. Name and explain a minimum of two diseases/ disorders of the nervous system. Relate how aromatherapy can be used to help these conditions.

Epilepsy is a condition that affects the central nervous system. An outbreak of chaotic electrical activity in the brain leads to a seizure, which can be partial or result in loss of consciousness. There are many causes of epilepsy including birth trauma,

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