Explain static and dynamic equilibrium and their interrelationships
What will be an ideal response?
Static equilibrium is regulated by the maculae of the vestibule. The maculae report on the position of the head with respect to the pull of gravity when the body is at rest. Each macula is a patch of receptor cells embedded in the otolithic membrane. The otolithic membrane contains otoliths which roll in response to changes in the pull of gravity. This movement causes the hair cells of the membrane to bend, sending impulses along the vestibular nerve to the cerebellum, relating information regarding the position of the head in space. Dynamic equilibrium is regulated by the semicircular canals. The crista ampullaris of the membranous semicircular canal consists of a tuft of hair cells and their gelatinous cap called the cupula. Movement of the head causes the cupula to move in the opposite direction, stimulating the hair cells, which then transmit impulses up the vestibular nerve to the cerebellum. Static and dynamic equilibrium work together to provide information to the cerebellum to help control balance.
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a) B b) C c) D d) E e) None of these choices
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