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🧠 How does the human brain work?

Neurons, maps, chemistry, perceive-act loops, and plastic costly wetware that rewires with use.

lessons

~20 min

to learn

🔬 Science

subject

Adults

level

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What you’ll learn

Cells that wire a mindDescribe neurons, glia, synapses, and brain scale.Spikes and synapses compute; glia support and myelinate; the network scale is tens of billions of neurons, not a single chip.
Maps of the brainLocate lobes, maps, and key subcortical partners.Cortical neighborhoods and body maps matter, but functions live in networks with thalamus, basal ganglia, hippocampus, brainstem, and cerebellum.
Signals and chemistryExplain transmitters, E/I balance, neuromodulation, and the blood-brain barrier.Glutamate and GABA dominate fast signaling; modulators retune state; the barrier protects and constrains access.
Systems in actionConnect sensation, action, body loops, and language networks.Perception is constructive, movement is hierarchical control, body state shapes mind state, language is networked.
Plasticity energy and careLink plasticity, sleep, metabolism, and non-advice boundaries.Learning rewires synapses; sleep supports brain function; energy costs are high; personal medical care is outside this course.

Questions this course answers

Match each cell idea to its role

Neurons compute with spikes; glia myelinate, support, and defend — partners, not packing material.

Order events at a typical chemical synapse

Electrical spike becomes chemical message, then the next cell's electrical/chemical response, then cleanup.

What does the cortical homunculus mainly illustrate?

Motor and sensory maps are topographic but distorted toward hands, face, and other high-resolution parts.

Match region to a classic emphasis

These landmarks are teaching handles; real tasks still recruit wider networks.

Fill the main inhibitory transmitter in adult cortex

GABA provides much of the fast inhibition that balances glutamate excitation.

Why is the blood-brain barrier both protective and a drug-delivery problem?

Selective impermeability shields the brain's environment and simultaneously blocks many therapeutic molecules.

Grounded in trusted sources

National Institute of Neurological Disorders and Stroke (NINDS) public brain basics materials
OpenStax Anatomy & Physiology — nervous system and brain chapters
Azevedo et al. and related peer-reviewed neuron-counting literature popularized in modern neuroscience teaching (~86 billion neurons)
NIH / MedlinePlus and Society for Neuroscience educational resources on synapses, plasticity, and brain energy use

Every Wunder lesson is built from real, reputable sources — never invented.

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