A reflex action is an ____ (involuntary) and ____ response to a ____, which minimises any ____ to the body from potentially ____ conditions, such as ____ something hot. Reflex actions are therefore ____ to the survival of many ____. A reflex action does not involve the ____ part of the brain. This is why the ____ is so fast. Organisms are able to ____ a reflex action and overcome it, but this uses the ____ and has to be learnt. For example, ____ hold of a hot object requires a nerve ____ to be sent to the motor neuron of the reflex arc to ____ with the normal reflex ____ to drop the object. Neurons are not in direct ____ with one another. There is a ____ gap between each called a ____. This means that it isn't ____ for an electrical impulse to be ____ directly between neurons and another ____ has to take place at synapses. Special ____ called neurotransmitters ____ across this gap, from an area of ____ concentration to an area of low ____. On the other side they bind with ____ that have a matching specific ____ and stimulate the creation of a new ____ in the next neuron. The ____ across a synapse is only around 30 ____ so this process takes place extremely ____.

Reflex Arcs And Synapses

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