please keep your answer short and sweet!
2006-09-17 10:07:36 · 18 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Reflex action is not dependent on conscious thought.
2006-09-17 10:10:23 · answer #1 · answered by WC 7 · 0⤊ 0⤋
reflex actions occur spontaniously, messages are being transferref from the motor neurons into the medulla oblongata (where the invoulntry reactions is controlled), this is not only under the brain itself (i.e smaller travel distance), but also involves no thinking... the later undergoes many complex thinking and acting mechanisms ..
and example could be, when holding a hot plate suddenly which contains the meal you have been cooking for the last 2 hours. if it was a reflex reaction, you would throw the plate in the air. however, since it is voluntry, you think and compromise between all the effort you did and getting a little burn and take a proper action like lying it very safely on the table.
2006-09-18 01:27:34 · answer #2 · answered by Sea Bass 4 · 0⤊ 0⤋
Reflex reactions come straight from the lower parts of your brain. Voluntary reactions have to go from the stimuli to the upper brain and then back to the muscles.
2006-09-17 22:30:00 · answer #3 · answered by smm_8514 5 · 0⤊ 0⤋
Reflex reaction is faster than voluntary reaction because our nerve endings react faster to external stimulus and our neurons fired the impulses before our brain could react quickly enough. For e.g. we pull our hand away from a hot surface instantaneously before we realised it and only than we feel the onset of pain.
2006-09-17 23:07:25 · answer #4 · answered by William L 1 · 0⤊ 0⤋
In reflex reaction, your body has 'known' the situattion very well already. Hence impulses can travel along axons and dendrons in an extremely short time and to the effector which carry out the action.
2006-09-18 03:30:59 · answer #5 · answered by loveharrypotter 1 · 0⤊ 0⤋
because information does not have to be send and processed in the brain in the same way for a reflex reaction
2006-09-17 17:17:12 · answer #6 · answered by greenday_fan 3 · 0⤊ 0⤋
shorter distance for the 'signal' to travel. a voluntary reaction goes from the sensory neurone to the spinal chord, up to the brain, down the spinal chord and to the motor neurone.
however, a reflex reaction goes from the sensory neurone to the spinal chord and straight to the motor neurone. it bypasses the brain altogether. therefore the travelling distance is shorter and time isnt wasted 'thinking' of a response.
2006-09-17 17:12:39 · answer #7 · answered by vish 2 · 2⤊ 0⤋
Reflex is instant voluntary is a decision that has to be voted upon.
2006-09-17 17:21:28 · answer #8 · answered by Crazy Diamond 6 · 0⤊ 0⤋
Because the signal does not have to go up to the brain. It is mediated through the spinal cord in a "subsystem" known as the Enteric nervous system.
2006-09-18 09:15:34 · answer #9 · answered by Anonymous · 0⤊ 0⤋
During reflex action the spinal cord will act instead of brain so it is fast.
2006-09-17 18:22:38 · answer #10 · answered by moosa 5 · 0⤊ 0⤋