When blood calcium levels drop, the parathyroid gland secretes parathyroid hormone. This hormone works to raise blood calcium levels by stimulating osteoclasts to break down bone and release calcium into the bloodstream. PTH also signals your kidneys to conserve calcium by reducing the amount excreted in the urine.itamin D. Vitamin D acts as a hormone in your body to help regulate blood calcium. This steroid hormone is so vital in maintaining calcium balance that its active form is sometimes referred to as calcitriol.
The Colosseum, originally known as the Flavian Amphitheatre, is a large amphitheatre in the city of Rome. The construction of the Colosseum started around 70â72 AD and was finished in 80 AD.Emperor Vespasian started the works, and Emperor Titus completed them. Emperor Domitian made some changes to the building between 81â96AD. It had seating for 50,000 people. It was 156 metres wide, 189 metres long and 57 metres tall.he Colosseum is a free standing building, quite different to the earlier Greek theatres which were built into the sides of hills. It is really two Roman theatres joined together. It is oval shaped, 189 meters (615 ft / 640 Roman feet) long, and 156 meters (510 ft / 528 Roman feet) wide.
The Colosseum's original Latin name was Amphitheatrum Flavium, often anglicized as Flavian Amphitheater. The building was constructed by emperors of the Flavian dynasty, hence its original name. This name is still used frequently in modern English, but it is generally unknown.nlike earlier amphitheatres that were built into hillsides, the Colosseum is an entirely free-standing structure. It is elliptical in plan and is 189 metres (615 ft / 640 Roman feet) long, and 156 metres (510 ft / 528 Roman feet) wide, with a base area of 6 acres.