YOUR NEXT DISCOVERY

Human Nervous System: A Discovery

Discover how living cells turn information into perception, action and learning.

7 Units38 MissionsAbout 16 hoursCourse map

Complete the Course to Earn a Certificate and Join the Hall of Fame

A stylised folded brain is linked to branching information routes, an eye and a hand. This welcoming whole-system illustration is not a scale anatomy diagram.
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A large message cell above three linked stations suggests a journey from receiving information to processing and action. It complements the whole-brain entrance.

A CLOSER LOOK

Find the living routes

Understand how you notice the world, move, learn and keep internal conditions steady. Follow each step and judge claims from evidence.

See it. Try it. Make it yours.

  1. Find the living routes

  2. Build and combine a signal

  3. Navigate central circuits

Biology beginner, including learners who need simple English. · What to know before you start

Bring with you: You can read short everyday sentences, compare whole numbers and follow an arrow. No biology, chemistry, electricity or graph knowledge is assumed.

Understand how you notice the world, move, learn and keep internal conditions steady. Follow each step and judge claims from evidence.

A deep first course: explain mechanisms, trace spatial routes, predict stated changes and use evidence in unfamiliar nervous-system cases. Professional clinical competence and lasting mastery are not claimed from completion.

By the end, you can…

  • Trace information and distinguish a cell, a fibre, a nerve and a complete pathway.
  • Explain membrane changes and synaptic communication; predict how a specified change affects signalling.
  • Follow spinal and brain circuits through relays, branches and crossings.
  • Explain sensory conversion and compare unfamiliar sight, sound, balance and body-sense cases.
  • Predict how motor and autonomic systems respond to changing targets, errors and internal conditions.
  • Explain learning and state changes and evaluate what an observation can establish.
  • Solve new mixed cases by tracing mechanisms, testing alternatives and explaining conclusions.

For another Course

  • Clinical diagnosis, treatment, medicines and emergency advice.
  • Memorising every named nucleus, cranial nerve branch or receptor subtype.
  • Advanced membrane equations, molecular reaction pathways and professional interpretation of scans.

YOUR LEARNING PATH

One idea leads to the next.

0 of 38 Missions completed or proven
Unit 1

Find the living routes

Trace information and distinguish a cell, a fibre, a nerve and a complete pathway.

  1. Notice, work out, actMission 1 of 38Locked. Separate the physical event, detection, information processing and response.
  2. Find the routes and the directionMission 2 of 38Locked. Locate central and peripheral tissue and trace incoming and outgoing information.
  3. Inside a neuron and its support systemMission 3 of 38Locked. Relate cell structures to local signals, long-distance signals and support.
Unit 2

Build and combine a signal

Explain membrane changes and synaptic communication; predict how a specified change affects signalling.

  1. Particles, charge and available pathsMission 4 of 38Locked. Predict net particle movement using concentration, charge and available paths.
  2. Keep a membrane ready to signalMission 5 of 38Locked. Explain selective channels, active maintenance and resting-voltage records.
  3. Start and end one action potentialMission 6 of 38Locked. Explain threshold and the ordered channel changes that make one spike.
  4. Carry information along the axonMission 7 of 38Locked. Predict propagation, recovery and coding from new time and population records.
  5. Cross from one cell to the nextMission 8 of 38Locked. Explain release, receiving action and clearance at a chemical synapse.
  6. Combine small inputs before a spikeMission 9 of 38Locked. Predict output from stated local inputs, their timing and their combined effect.
Unit 3

Navigate central circuits

Follow spinal and brain circuits through relays, branches and crossings.

  1. Read the spinal cord from outside to insideMission 10 of 38Locked. Trace a body sensory route and a motor route through roots, gray matter and long tracts.
  2. Read the cerebral surface and its connectionsMission 11 of 38Locked. Explain how specialised areas and connecting routes cooperate without single-spot myths.
  3. Connect the deeper brain systemsMission 12 of 38Locked. Relate relay, coordination, selection, internal regulation and state control to a common action.
  4. Compare fast response circuitsMission 13 of 38Locked. Trace withdrawal and stretch circuits, including inhibitory branches and information to the brain.
  5. Follow ascending routes and crossingsMission 14 of 38Locked. Track side and relay order through sensory pathways and distinguish a pathway from one neuron.
Unit 4

Turn the world into information

Explain sensory conversion and compare unfamiliar sight, sound, balance and body-sense cases.

  1. Read what a sensory signal can tell youMission 15 of 38Locked. Distinguish sensory conversion, stimulus dimensions, receptive fields and adaptation.
  2. Get a focused image to the retinaMission 16 of 38Locked. Trace light through the eye and predict changes in focusing and light entry.
  3. Turn retinal light into neural activityMission 17 of 38Locked. Compare retinal detectors, convergence and changes in signalling.
  4. Follow the scene through two eyesMission 18 of 38Locked. Trace visual-field information and distinguish detection, routing and interpretation.
  5. Carry sound to the inner earMission 19 of 38Locked. Distinguish frequency and amplitude and trace mechanical sound transfer.
  6. Turn sound motion into a codeMission 20 of 38Locked. Explain hair-cell conversion and interpret place, timing and intensity patterns.
  7. Detect turning, tilt and accelerationMission 21 of 38Locked. Explain vestibular detector mechanics and why balance needs combined clues.
  8. Locate touch and know body positionMission 22 of 38Locked. Explain body-sense precision, proprioceptive feedback and the difference between nociception and pain.
  9. Taste, smell and combine the cluesMission 23 of 38Locked. Explain chemical detection and why flavour is more than taste alone.
Unit 5

Control movement and the inside

Predict how motor and autonomic systems respond to changing targets, errors and internal conditions.

  1. From a central plan to a muscle signalMission 24 of 38Locked. Trace descending influences and a chemical neuromuscular junction.
  2. Turn muscle signals into controlled forceMission 25 of 38Locked. Explain force production and predict effects of motor-unit recruitment and rate.
  3. Guide a changing movementMission 26 of 38Locked. Compare feedback, prediction and opposing-muscle coordination during a changing task.
  4. Trace autonomic output to different targetsMission 27 of 38Locked. Explain two-neuron output chains, branch organisation and receptor-dependent effects.
  5. Follow a variable around a feedback loopMission 28 of 38Locked. Explain a negative-feedback loop and trace a specified arterial-pressure change.
  6. Compare local control and feedback faultsMission 29 of 38Locked. Compare enteric and central loops and predict detector, effector and delay changes.
Unit 6

Learn, rest and judge evidence

Explain learning and state changes and evaluate what an observation can establish.

  1. What changes when a network learns?Mission 30 of 38Locked. Interpret controlled plasticity observations and distinguish encoding, storage and retrieval.
  2. Memory systems and useful practiceMission 31 of 38Locked. Compare memory demands and design practice that tests retrieval and transfer.
  3. Understand an active brain at restMission 32 of 38Locked. Compare daily timing, sleep pressure and sleep-stage patterns without treating sleep as shutdown.
  4. Protect, supply and maintain living tissueMission 33 of 38Locked. Explain protective layers, fluid circulation and selective blood-to-brain supply as distinct supports.
  5. Ask what the observation can proveMission 34 of 38Locked. Interpret behavioural, electrical and imaging observations and compare alternative explanations.
Unit 7

Use the complete system

Solve new mixed cases by tracing mechanisms, testing alternatives and explaining conclusions.

  1. Investigate a selective circuit changeMission 35 of 38Locked. Use preserved and missing observations to compare faults across cells and pathways.
  2. Investigate a changing control loopMission 36 of 38Locked. Distinguish early predictions, delayed feedback and learning from combined observations.
  3. Discovery investigation: routes and recordsMission 37 of 38Locked. Trace an unfamiliar multi-scale action and interpret selective signal records.
  4. Discovery investigation: control and evidenceMission 38 of 38Locked. Transfer loop reasoning and defend new evidence claims with explicit limits.Mastery Challenge

A Debsie Course · Biology beginner, including learners who need simple English.