Presentation is loading. Please wait.

Presentation is loading. Please wait.

Title: Reflex Actions Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals.

Similar presentations


Presentation on theme: "Title: Reflex Actions Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals."— Presentation transcript:

1 Title: Reflex Actions Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals

2 Automatic responses are known as reflexes. E.g. Pulling your hand away when you touch something hot. What are Reflexes? Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals

3 Reflexes help your avoid danger or harm. They also take care of your basic body functions like breathing. What are Reflexes for? Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals

4 Reflexes actions involve a reflex arc, which is an impulse sent from a sensory neuron to a relay neuron in the CNS. The impulse is then sent along a motor neuron to an effector organ. How do reflex actions work? Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals

5 How do reflex actions work? Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals

6 Your nerves are not joined directly to each other, there are junctions between them known as synapses How do synapses work? Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals

7 E.g. When an impulse from a sensory neuron arrives at a synapse with a relay neuron, a chemical messenger is released. The chemical travels across the synapse to the relay neuron. This sets off an electrical impulse that travels along the relay neuron. How do synapses work? Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals

8 E.g. When an impulse from a sensory neuron arrives at a synapse with a relay neuron, a chemical messenger is released. The chemical travels across the synapse to the relay neuron. This sets off an electrical impulse that travels along the relay neuron. How do synapses work? Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals

9 1. In a Arc, the electrical impulse bypasses the areas of the brain. The time between the and the Is as short as possible. Only neurons,.... neurons and neurons are involved. 2. Draw a flow chart to explain what happens when you step on a pin. 3. Using the example of a relay and motor neuron, explain how a synapse works. Task Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals


Download ppt "Title: Reflex Actions Learning Objectives What is a reflex? Why are reflexes so important? Key Words: Reflexes, reflex arc, synapses, relay neuron, chemicals."

Similar presentations


Ads by Google