1. LO: Define reflex actions Label the reflex arc List common examples of reflexes What is a reflex action?

2. LO: 26/2/10 What is a reflex action? LO: Define reflex actions Draw the reflex arc List common examples of reflexes

3. LO: 26/2/10 What is a reflex action? LO: Define reflex actions Draw the reflex arc List common examples of reflexes “reflex actions are automatic responses to stimuli”

5. STIMULUS RESPONSE Sensory Neurone Motor Neurone Relay Neurone Sensory Receptor Motor-end plate (effector)

6. 7 cards – 1 each Sort them into the right order First team gets a merit each In groups of 7:

7. SYNAPSE CLIP

8. 26/2/10 What is a reflex action? Synapses Where two neurones meet, there is a tiny gap called a synapse. Signals cross this gap using chemicals. One neurone releases the chemical (a neurotransmitter) into the gap. The chemical diffuses across the gap and makes the next neurone transmit an electrical signal. Synapse neurone chemical (neurotransmitter) diffusing across gap

9. STIMULUS RESPONSE Sensory Neurone Motor Neurone Relay Neurone Sensory Receptor Motor-end plate (effector) synapse

10. LO: Examples of Reflex Actions

11. Find out about Myasthenia Gravis: What is it? Why is it related to synapses? How can it be treated? 1/2 page max in your books! http://www.muscular-dystrophy.org Homework: Due Wednesday after ½ term

12. LO: Define reflex actions Label the reflex arc List common examples of reflexes What is a reflex action?