Understanding Neurone Structure, Nervous Responses & Pathways
Explore the structure of neurones and their functions, the flow of nervous responses, and pathways in the nervous system. Learn how stimuli are detected, processed, and responded to through sensory, relay, and motor neurones. Dive into the detailed pathway when tasting something bad and spitting it out. Visual aids and a model answer provided for easy understanding.
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Presentation Transcript
Combined Science - Biology - KS4 Homeostasis and Response The Nervous System Miss Ray
Match the neurone structure to its function. Structure Axon Myelin Sheath Function Insulates the axon. Small parts of exposed axon that promote fast conduction of electrical impulses. Receives impulses from another neurone / receptor. Carries impulses along the neurone. Dendron Node of Ranvier 2
Answers are rearranged into the correct order. Structure Axon Myelin Sheath Dendron Function Carries impulses along the neurone. Insulates the axon. Receives impulses from another neurone / receptor. Small parts of exposed axon that promote fast conduction of electrical impulses. Node of Ranvier 3
Draw a flowchart to show the full nervous response including neurones. 4
STIMULUS Receptor Sensory neurone Relay neurone (in CNS) Motor neurone Effector RESPONSE 5
Describe the nervous response pathway when you taste something bad and spit it out. Keywords: stimulus, chemical receptor, sensory neurone, relay neurone, motor neurone, muscles, response, electrical impulse, chemicals Hint - use your flow chart! 6
Model answer STIMULUS The stimulus is the chemicals within the food. Receptor This is detected by chemical receptors in the tongue. Sensory neurone The receptor sends an electrical impulse along the sensory neurone to the brain. Relay neurone (in CNS) The impulse travels via the relay neurone to the motor neurone and then to the muscles in the mouth. Motor neurone These muscles contract and the response is the person spitting out the food. Effector RESPONSE 7
