Reflex Actions
- Created by: Annie
- Created on: 05-03-13 17:39
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- Reflex Actions
- Reflex
- When you touch something hot or sharp you pull your hand back before you do so. Automatic responses such as this are called Reflexes.
- Good, because help you avoid danger or harm. Reflexes happen in body, moving food through gut and breathing.
- Include 3 neurons: Sensory, Motor, Relay
- Reflex Arc
- 1. Electrical Impulse passes from Sensory receptor along sensory neuron to CNS
- 2. It passes along relay neuron. In spinal chord and back along motor neuron.
- 3. From there impulse arrives at effector organ.
- KEY POINT
- impulse bypasses concious area in brain time between stimulus and reflex action is short as possible
- Relay Neuron
- Connect sensory and motor neurons. Relay neurons in CNS
- Synapses
- Nerves aren't joined directly together. There are junctions in between called synapses. Electrical impulses have to cross these synapses.
- Reflex
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