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.
Shark 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.lthough the two groups once shared a common ancestor, there are several major biological differences between them. Teleosts, the bony fish, are some of the most abundant vertebrates on the planet with nearly 25,000 living species. In contrast, the chondrichthians represent only about 1,100 species of extant species of.