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 name Flavium is the family/dynasty name of the Roman Emperors who built the Colosseum. The present day name Colosseum, or rather Colosseo, is said to have come from the colossal 35m (115 feet) high bronze statue of Nero, The Colossus, that stood between the stadium and the Roman Forum.he ancient Roman Colosseum was the first free-standing amphitheater. It has an elliptical (oval) plan with a length of 189m (620 feet), height 48m (158 feet) and width 156m (512 feet).