Chapter: 3 Movement in & out of Cells


The pathway along which the nerve impulse passes – the sensory neurone, relay neurons and motor neurone – is called reflex arc



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The pathway along which the nerve impulse passes – the sensory neurone, relay neurons and motor neurone – is called reflex arc.

  • The pathway along which the nerve impulse passes – the sensory neurone, relay neurons and motor neurone – is called reflex arc.
  • The three types of neurone that are involved in a reflex arc have different shapes.
  • The reaction that happens after the impulse has sped around the reflex arc called a reflex action.
  • You do not need to think about reflex action, but you only consciously realize what is happening after the electrical impulse has been sent on to your muscles.
  • Reflex action very useful because information gets from the receptor to the effector as quickly as possible.
  • You do not waste time in thinking about what to do.
  • Reflex action are automatic actions.
  • They help to coordinate our actions.
  • If you receive more than one stimulus at once – such as the sound of a roar and the sight of a lion leaping towards you – these stimuli will be integrated to produce electrical impluses in sensory neurons, which will travel very quickly around a reflex arc and produce an appropriate and very fast response.

Ziad ahmed – IGCSE-AS-A-Level-IB Biology Teacher WhatsApp: +974-55596985

Ziad ahmed – IGCSE-AS-A-Level-IB Biology Teacher WhatsApp: +974-55596985



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