Thyroid 101. Located above the Adam's apple, your thyroid produces thyroid hormone (TH), which regulates, among other things, your body's temperature, metabolism, and heartbeat. Things can start to go wrong when your thyroid is under- or over-active. If it's sluggish, it produces too little TH; amped-up and it produces too much.
yes but what is it to you. As with most fish, perch fish do not have eyelids. They are, however, covered by a layer of transparent integument or coating to keep the eye protected.no a perch fish does not have eyelids but they have viginas.ome do but alot of them don't. Some like the leopard geckos, fat tail geckos, cat geckos, and more do have eyelids. Crested geckos, tokay geckos, banana geckos, and more do n â¦ ot have eyelids. The ones that don't have eyelids lick their eyes to keep them moist and clean.
1 The skull of a shark is made of only 10 cartilaginous elements while a bony fish skull has about 63 bones. 2  Bony fish have pleural ribs formed from dermal bone and sharks lack these ribs.3  Unlike bony fish that have a protective bony plate covering their vulnerable gills, the gill slits of a shark are exposed and visible.hark species have eyelids and some can even protect their eye with a tough third eyelid called a nictating membrane. Other species, like the great white shark, have muscles that can roll the eye back into the socket for protection. Bony fish lack eyelids or the ability to protect their eyes.