The nictitating membrane of the eye a. Is also called the “second eyelid” b. Is visible with some injuries or illnesses c. Provides all of the protection for the eyeball d. Is non-functional as protection nictitating membrane of the eye

what statement best describes the difference between the sympathetic and parasympathetic nervous systems?

the sympathetic nervous system prepares the body for intense physical activity and is often referred to as the fight-or-flight response. the parasympathetic nervous system has almost the exact opposite effect and relaxes the body and inhibits or slows many high energy functions.

other information encoded in your genes might distinguish you from the others in the group

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.