Brain Messages
How signals move through neurons, across synapses, and around whole networks.
Module 2 follows a single message from one end of a neuron to the next cell, then zooms out to networks. You will build an action potential step by step, cross a synapse, sort neurotransmitters by what they do, and see why myelin and reflexes make some responses faster than thought. Five lessons, roughly 8–12 minutes each.
How this module works
Each lesson opens with a real-life hook and a short set of objectives, then mixes short readings with hands-on activities — simulations, sorting, predictions, and quick checks that explain every answer. Your progress is saved on this device only. This page is the menu, not a lesson.
Quick pre-check
No wrong answers—just notice where you are today.
Lessons
- Lesson 1: Inside a neuron: the electrical signalHow a message travels along a single cell.
- Lesson 2: Across the synapse: chemical messengersWhat happens in the tiny gap between two neurons.
- Lesson 3: Neurotransmitters and networksWhy no single chemical — or region — acts alone.
- Lesson 4: Speed, myelin, and reflexesWhy some responses beat your awareness to the finish line.
- Lesson 5: Check your understandingQuick check, reflection, applied challenge, and anonymous feedback.
Sources and further learning
- National Institute of Neurological Disorders and Stroke (NINDS)Public information on the nervous system, neurons, myelin, and neurological conditions.
- Society for Neuroscience — BrainFacts.orgPeer-reviewed public education resources on neural signaling and brain research.
- National Institutes of Health (NIH)Overviews of ongoing neuroscience research and how findings are established.