If you need eye drops for dry eyes â known as artificial tears â choose a brand without the preservative benzalkonium chloride, which can cause irritation, says Andrew Lotery, professor of ophthalmology at the University of Southampton. âYou tend to find it in eye drops that come in bottles,â he says.
Endorphins are natural opium-like hormones that are produced by the pituitary gland and the hypothalamus of your body. Endorphins act on your brain's opiate receptors to block their ability to receive pain messages from the sensory nerves. This makes you less sensitive to pain. Endorphins also work on your emotions.
Endocrine System. The endocrine system is made up of a group of glands that produce the body's long-distance messengers, or hormones. Hormones are chemicals that control body functions, such as metabolism, growth, and sexual development.he muscular system is made up of tissues that work with the skeletal system to control movement of the body. Some musclesâlike the ones in your arms and legsâare voluntary, meaning that you decide when to move them. Other muscles, like the ones in your stomach, heart, intestines and other organs, are involuntary.