The sense of balance
The position and acceleration of the head is detected by the inner ear.
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Olfactory receptors produce electric signals when stimulated by odours.
The ear converts the vibrations of air into electric signals which are then processed by the brain.
The eye is one of our most important sense organs. When stimulated by light, electric impulses are produced by its receptors.
Taste receptors convert chemical stimuli into electric signals.
This animation shows the symptoms and treatment of secretory otitis media.
Several analogous types of eyes have developed independently through convergent evolution.
The central nervous system consists of the brain and the spinal cord, the peripheral nervous system consists of nerves and ganglia.
The curvature of the lens of the eye changes when we look at a distant or at a near object, to ensure a sharp image.
Organs that detect signals of the environment or of the body and transmit them to the brain as nerve impulses.
Concave and convex lenses are used for the correction of short-sightedness and far-sightedness.