Automatic moves(How reflex works)

Caisar Oentoro113090064 / IF-33-05

13-12-2010

What is reflex?• Reflex is involuntary fast reaction by our

nervous systems.

• They active our muscles in situations where our brain would take too long to react and protecting us from external danger

Purpose/functions

2 Kinds of body movements• VOLUNTARY MOVEMENT: You realized it

then you do it.• INVOLUNTARY MOVEMENT: You do it

then you realize it.

Voluntary movement• Voluntary movements occur in response to

messages from the brain, for example turning the button of the stove.

Voluntary movement mechanisms

Involuntary movement• An automatic action. The body moves in

response to stimulus.

Involuntary movements

• And this is carried out even before the brain has become aware of it

Involuntary movements mechanism

Involuntary movements mechanism

Involuntary movements mechanism

Involuntary movements mechanism

Summarize• How reflex works:

• It received stimulus from outside of our body.• The stimulus signal then transmitted to spinal

cord via sensory neuron• Spinal cord then send back signal to the

muscle(via motor neuron) to move automatically.

• At the same time spinal cord send signal to the brain to be processed, and finally we realize our reflex movements

THAT’S ALL

THANK YOU FOR YOUR ATTENTION

WASSALAMMUALAIKUM, WR, WB

SOURCES:• Microsoft Student with Encarta 2009 DVD,

How Reflex Works