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  1. receptor detects a stimulus - change in the environment
  2. sensory neurone sends signal to relay neurone
  3. motor neurone sends signal to effector
  4. effector produces a response
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9y ago
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10y ago

The steps involved in a reflex arc start with a stimulus at a sensory neuron, travel of the stimulus by way of the sensory neuron to the spinal cord. At a relay or interneuron in the cord, the stimulus now travels by way of a motor neuron to a muscle (or gland). The muscle responds. A good example of this is what happens if a person touches a very hot surface. They will rapidly pull the hand away.

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10y ago

Most reflex arcs have three parts: sensory info in via sensory neuron, synapsis at an interneuron (in the spinal cord), synapsis out of interneuron to a motor neuron and a motor response. The interneuron also sends info to the brain and the person become aware of it. This is a more common reflex.

Some reflex arcs have only the sensory neuron info in and the motor out. The knee jerk reflex is an example. These are more rapid.

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13y ago

receptor, sensory neurone, CNS, motor neurone, and effector

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13y ago

Receptor; Effector

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13y ago

right atrium,aorta and left ventricle

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Q: What is the sequence of events in a typical reflex arc?
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