Static and dynamic equilibrium
- ICSE Class 10, Unit 3 Human Anatomy and Physiology
Static equilibrium is balance while the head is still, and dynamic equilibrium is balance while the head or body moves; the inner ear controls both.
The inner ear does two jobs: hearing and balance. The cochlea hears. Other parts sense how your head is placed and how it moves. Each kind of balance has its own part:
- Static equilibrium: the utriculus and sacculus, in the vestibule. They sense the position of the head when you are still.
- Dynamic equilibrium: the three semicircular canals. They sense turning and movement. Each canal has a swelling at one end, the ampulla, with the sense cells in it.
A small example
Stand still with your head tilted: the utriculus and sacculus tell the brain which way is down. Now spin around a few times and stop. You feel dizzy, because the fluid in your semicircular canals is still moving.
Where marks go
The 2024 ICSE Biology paper asked which parts control static and dynamic equilibrium. CISCE's 2024 Biology report names confusion between the semicircular canals and the utriculus and sacculus. It also notes answers that wrote only "ampulla" without naming the semicircular canals.
In 2025, a question about a gymnast asked for the part and then the type of balance. The two answers are linked. CISCE's 2025 report names wrong pairs such as "semicircular canals and static equilibrium". Learn each part with its balance, as one fact. See why marks slip away on answers you know.
Sources
Facts last checked against these sources on 30 September 2026.
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