Theropoda /Î¸É¨ËrÉpÉµdÉ/ , from Greek meaning beast feet) are a group of saurischian dinosaurs. Theropods were ancestrally carnivorous, although a number of theropod groups evolved herbivory, omnivory, piscivory, and insectivory.
Monday March 8 2010. Vitamin D forms in our skin in response to sunlight. The Daily Telegraph has reported that âvitamin D 'triggers and arms' the immune systemâ. It said that researchers believe that vitamin D plays a key role in boosting the immune system. The study looked at human T cells in the laboratory, and found that vitamin D was part of a complex process in which T cells become 'primed' and help to fight infection.
Vitamin D is the name given to a group of fat-soluble prohormones (substances that usually have little hormonal activity by themselves but that the body can turn into hormones). Vitamin D helps the body use calcium and phosphorus to make strong bones and teeth. Skin exposed to sunshine can make vitamin D, and vitamin D can also be obtained from certain foods. Vitamin D deficiency can cause a weakening of the bones that is called rickets in children and osteomalacia in adults. Two major forms of vitamin D that are important to humans are vitamin D2, or ergocalciferol, and vitamin D3, or cholecalciferol.