Nervous System Essay - by Justinhunt - Anti Essays

NERVOUS SYSTEM ESSAY


Our nervous system is very important towards our learning ability. It allows us to

sit in class, listen, watch, take notes, and analyze what the teacher is teaching. The

nervous system is split into two parts, the central nervous system and the peripheral

nervous system. The peripheral nervous system is then split into the sensory division and

the motor division. The central nervous system includes the brain and the spinal cord. It

is the control center of the body. However the central nervous system needs the

peripheral nervous system to make a link between the central nervous system and the rest

of the body. The sensory division is responsible for sending impulses from sensory organs

to the central nervous system and the motor division sends impulses from the central

nervous system to the muscles or glands.

The sensory division of the peripheral nervous system controls our ability to listen

and watch the teacher in class. Sounds are vibrations that can be detected by the ear. Ears

can detect pitch and loudness. The fleshy exterior part of the ear acts like a sound funnel.

The vibrations travel to the eardrum, malleus, incus, stapes, oval window, and cochlea. In

the cochlea, the vibrations move the surrounding hair cells and the stimulation is

changed to nerve impulses. The nerve impulses are then sent to the brain through the

acoustic nerve. We sense light using our eyes. The pupil, small black disk in the eye, and

the muscles in the iris, the part of the eye that gives it its color, together regulates the

amount of light that enters the eye. Behind the iris is a lens made of crystalin that bends

allowing the eye to focus. In the retina, there are photoreceptors that convert light energy

to impulses sent to the central nervous system. That's how we are able to see and listen in

c...

Nervous System essay - Mega Essays

NERVOUS SYSTEM ESSAY Our nervous system is very important towards our learning ability. ... The nervous system is split into two parts, the central nervous system and the peripheral nervous system. ... The central nervous system includes the brain and the spinal cord. ... However the central nervous system needs the peripheral nervous system to ...


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Nervous System essay essaysOur nervous system is very important towards our learning ability