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
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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