In a simple reflex action:

stimulus → receptor → sensory neurone → relay neurone → motor neurone → effector

stimulus → receptor → relay neurone→ sensory neurone → motor neurone → effector

stimulus → sensory neurone → motor neurone → relay neurone → receptor → effector

stimulus → receptor → motor neurone → relay neurone → sensory neurone → effector

Quiz

Biology: The nervous system

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1The skin is sensitive to what?
1. Alight
2. Bpressure
3. Cchemicals in the air
4. Dpain
5. Etouch
6. Fsound
7. Gtempreture
2The central nervous system consists of which body parts?
1. AThe brain
2. BThe Pelvis
3. CThe neck
4. DThe spinal chord
5. EThe diaphram
3Relay neurons...
1. Acarry signals from the CNS to effectors.
2. Bcarry signals from receptors to the spinal cord and brain.
3. Ccarry messages from one part of the CNS to another.
4In a simple reflex action:
1. Astimulus → receptor → relay neurone→ sensory neurone → motor neurone → effector
2. Bstimulus → receptor → sensory neurone → relay neurone → motor neurone → effector
3. Cstimulus → sensory neurone → motor neurone → relay neurone → receptor → effector
4. Dstimulus → receptor → motor neurone → relay neurone → sensory neurone → effector
5Which of these are examples of effectors?
1. AA muscle contracting
2. BBlood clotting
3. CA gland releasing a hormone
4. DThe heart pumping