Discover the Biology and Chemistry That Keep Us Alive.
Selectable schematic, not an anatomical scale drawing. Brain & nerves
Coordinate sensation, movement, memory, and many automatic functions.
Molecules at work
Sodium and potassium ions; neurotransmitters such as dopamine.
Process
Ion movement changes membrane voltage; synapses pass signals between cells.
Did you know? The brain needs a continuous supply of oxygen and energy.
Go deeper · biology and nursing
An action potential involves voltage-gated ion channels; a sodium-potassium pump maintains gradients.
Follow the connection
Structure: Brain & nerves
Watch human biology lessons at Khan Academy
The oxygen journey
In an educational model, blood leaves the lungs carrying oxygen to tissues. Which molecule binds much of that oxygen reversibly?
Educational physiology only. Fictional cases are not diagnostic or treatment guidance.
