Physiology question?

Question

Propose and explanation of the causes of vertigo and nausea in a seasick person

Answer 1

blame it on the choclea

Answer 2

The human body has an intrinsic "craving" to remain upright.

Two organs are responsible for ensuring that and detected changes in motion.

NUMBER 1, a special organ in the inner ear, called the Vestibular apparatus, which senses changes in motion, balance and the position of the head. This structure consists of 3 "semicircular canals" with fluid called endolymph and motion sensor cells with little hairs (cilia) whose ends are embedded in a gelatinous structure called the cupula. As the skull moves in a given direction, the endolymph moves in the opposite direction. Moving endolymph moves the cilia causing them to depolarize and a signal is then sent to the brain.

NUMBER 2, the EYE, which can detect the visual component of a moving scenary.

In seasickness, the head and the entire body is constantly moving up and down with the boat and this results in a continuous, "back-and-forth-type" stimulation of the hair cells in the vestibular apparatus and visual confusion on a moving craft, nearby objects "appear" to move with the motion of the craft. This "info" i basically triggering action potentials that are sent to the reticular formation in the pons that causes nausea. Vertigo occurs because when the body is in motion and stops, the fluid in the vestibular apparatus is still in motion and takes some time to come to rest as a result of its inertia. Hence, dizziness does NOT SUDDENLY disappear upon the body coming to a sudden stop. Other condition, ie drugs, tumors, etc affecting the vestibular system may also produce dizziness

Hope that helps