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LIFE SCIENCES - HUMAN RESPONSE TO THE ENVIRONMENT

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Biology

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1. dendrites
2. cell body
3. axon
4. myelin sheath
5. terminal end of axon

transmits impulses from receptors to the central nervous system

connects a sensory neuron to a motor neuron in the central nervous system

transmits impulses from the central nervous system to the effectors (muscles and glands) in the body

*ensures impulse moves in one direction only
*prevents continuous stimulation of neurons
*ensures impulses are transmitted from the sensory neuron to the motor neuron

1. Stimulus detected by receptors and converted into a nerve impulse.
2. The nerve impulse is transmitted along the sensory neuron through the dorsal root to the spinal cord.
3. The impulse is transmitted from the sensory neuron to an interneuron in the spinal cord.
4. The impulse is transmitted from the interneuron to a motor neuron in the spinal cord.
5. The impulse exits the spinal cord through the ventral root and is transmitted along the axon to the effector organs (muscle in arm contracts).
6. The hand pulls away from the stimulus quickly.