Basically, there are two kinds of body movements, conscious movements and reflex. Conscious body movement
is coordinated by the brain, e.g. when someone is bitten by insect,
he/she will know there is a stimulus on his/her skin that comes from out
of the body. This stimulus is received by nerve receptor on the skin.
The stimulus then will be changed into nerve impulses. The impulses then
will be transmitted to the brain by sensory nerve. By the brain, they
will be translated so the brain will know that there is an insect biting
on the skin. Then, the brain will instruct hand muscle (through motor
nerve) to chase away the insect.
Human Body Movement
Unconscious body movement is called reflex. Reflex is coordinated by
spinal cord but sometimes impulse can also reach brain. It depends on
how strong the impulse is. Look at Picture, when kneecap is drummed with
hammer, pain stimulus is received by receptor nerve. Stimulus then will
be changed into impulse by receptor and go through pass the sensory
nerve to the spinal cord. After processed by spinal cord, impulse will
be sent to effector muscle (foot) by motor nerve and make a foot
movement.
Read: Human Nervous System
Nervous system disorders can be fatal in all of organ system, e.g.
amnesia and epilepsy. Amnesia is a memory disturbace that is caused by
brain injury because of disease or hard head bump. Epilepsy is a
electricity activity disturbance on nerve in the brain that can be
temporary or permanently.
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