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Understanding Neuron Activation and Muscle Contraction in the Nervous System

In this engaging lesson, we explore the concept of threshold—the minimum level of impulse required to activate a neuron. We discuss how nerve impulses resemble falling dominoes, each one triggering the next. Our plan includes warm-ups, an introduction of our speaker, and a thought-provoking video on pushing limits. We'll reflect on anatomy and physiology with various activities, including neuron drawing, muscle fatigue experiments, and the action potential of muscles. This session will deepen your understanding of how our nervous system functions.

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Understanding Neuron Activation and Muscle Contraction in the Nervous System

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Presentation Transcript

  1. Glossary Date: Jan 29 , 2014Page: Table of Contents p 1 W.O.D: Last 5 pagesWarm-ups: Front CoverW.O.D. Threshold – the minimum level of an impulse needed to activate a neuron. Question: How are nerve impulses like dominoes?

  2. Today’s Plan • Warm-up • Introduce our speaker • Pushing the limits video • Grades – Get signed! • Reflect

  3. Anat& Phys Table of Contents (p. 1) • Your Brain & Your Nervous System p. 2 • Brain Notes/Find someone who… p. 3 • Brain Hemisphere Dominance p. 4 • The Secrets of the Brain Video p. 5 • Neuron Drawing p. 6 • Textbook Reading (p. 896-900) p. 7 • Senses/Stimuli game p. 8 • Reflex notes p. 9 • Reaction Vs. Reflex lab/Pre-Lab p. 10 • Human body: Pushing the Limits p. 11 • Muscle Reading/?’s Text 926-931 p. 12 • Muscles under the Microscope (+ Muscle Reading) p. 13 • Muscle Notes/Muscle Fatigue lab p. 14 • Pushing the Limits Video /Action Potential p.15

  4. Action potential of muscles

  5. Ions (charge elements) build up until • Na+ (sodium) gathers outside the membrane • K+ (Potassium) gathers inside the membrane • A signal from another nerve opens the channels, and the Na+ rushes in. K+ rushes out. • This repeats jumping down the nerves. • At the end of the nerve, Acetylcholine has been building up. • When the impulse reaches the neuromuscular junction, Acetylcholine channels are open, allowing it to rush out and trigger a muscle contraction.

  6. Reflection: Would you consider working for Youth Outdoors?

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