Some people get carsick and seasick when traveling by car or boat. Do you know what is going on? Let's talk about it (physics in Grade Two)

When riding a car or taking a boat, it is stimulated by vibration and shaking, which makes the inner ear of the human body unable to adapt and adjust the balance of the body well, which makes the sympathetic nerve excited and causes neurological dysfunction, causing dizziness, vomiting and other carsickness symptoms.

The human body can judge the direction and maintain its own balance, mainly relying on the superficial skin receptors, the deep receptors of the eyes, neck and body, and the inner ear, of which the inner ear is the most important. The semicircular canal, elliptical sac and balloon of the inner ear mainly play a balancing role. There are three semicircular canals, which are perpendicular to each other and form three sides of the space. They receive external balance stimulation, pass through vestibular nerve, reach the balance center of cerebral cortex, and regulate and manage the balance response.

Physiological basis of motion sickness: semicircular canal is the receptor of positive and negative rotational acceleration. When the semicircular canal is over-sensitive or over-stimulated, it will cause a series of autonomic reactions, such as carsickness.