When this happens, the thyroid gland is no longer under pituitary control. The amount of hormone it produces is dependent on levels of TSI. TSI are the direct cause of hyperthyroidism in Gravesâ disease and various immune system chemicals known as cytokines also contribute to the symptoms that occur in this disorder.
Confidence votes 20. Female Iguanas will lay eggs when they become sexually mature, which is around 1.5 to 2 years old. They do not need to be fertilized to lay so therefore do not need a male Iguana. They need to be healthy before they lay or else there can be very serious problems.
Several iguana species are known collectively as rock iguanas, and some are found on just one or two islands. Female rock iguanas lay a clutch of 5 to 20 relatively large eggs each year; the larger eggs result in large hatchlings that evolved in response to the lack of native predators.he smallest of the rock iguana group are the Turks and Caicos iguanas. All eat a wide variety of fruits and serve as important seed dispersers for many native plants. Many think lizards live only in deserts, yet the marine iguanas of the Galapagos GalÃ¡pagos (islands off the coast Of) ecuador are excellent. swimmers