Different types of neurones work together in a reflex action.
This creates an automatic, and rapid response to a stimulus, which protects the body from potentially harmful conditions, such as touching something hot.
A reflex action follows this general sequence and does not involve the conscious part of the brain, which makes it much quicker.
The nerve pathway followed by a reflex action is called a reflex arc. For example, a simple reflex arc happens if we accidentally touch something hot.
The signal is sent to the brain in additional relay neurones shortly afterwards or you wouldn't remember burning your hand. The time saved by sending this signal later than normal reduces damage to your body.
Where two neurones meet, there is a small gap, a synapse.
Synapses also allow one neurone to start signals in more than one neurone at the same time.
Scientists have studied how fast a neurone can transmit an electrical impulse in frogs.
They use the equation:
They measured the length of the neurone as 50 mm (0.05 m) and measured the time the impulse took to travel the length of the impulse as 1.5 ms (0.0015 s) Calculate the speed of the impulse to two decimal places in m/s.
Speed = =