Obj 2.85

2.85 describe the structure and functioning of a simple reflex arc illustrated by the withdrawal of a finger from a hot object

Stimulus: Hot flame

Receptor: Heat sensor in the skin
- The impulse travels to the spinal cord along the sensory neurone.
- In the spinal cord the impulse is passes on to the relay neurone.
- This passes the impulse on to the MOTOR NEURONE.

Effector: Arm muscles
The motor neuron carries the impulse to the muscle in the arm

Response: Muscles contract to remove the hand from the hot object.

Click4Biology p123 (image won't upload)

Extra notes from class:
After Sensory Neurone instead of taking the CNS it takes the short cut to the Relay Neurone and then passes the impulse down the motor Neurone to respond. Short cut to make the reaction faster. Called a Reflex