When the skin is exposed to ultraviolet rays, the skin produces a molecule that is turned into Vitamin D.
Sun is the source of ultraviolet rays important for Vitamin D production. Due to this reason, in the case of Vitamin D deficiency, it is recommended by doctor's to absorb sunlight by skin. The Vitamin D production occurs specifically by UV B rays rays which lie in the range of 290-315 nanometer.
The chemical 7-dehydrocholesterol absorbs these rays and convert to previtamin D3. Further, previtamin D3 isomerizes to Vitamin D. Other than sunlight, Vitamin D can be taken through diet. The sources include seafood like fish, fish oil, dairy products, beef liver etc. Vitamin D is required for bone and teeth formation, muscle contraction, immune system etc.
Learn more about Vitamin D -
brainly.com/question/4551554
#SPJ4
Answer:
The correct answer will be option-B
Explanation:
Emergency Medical Technician (EMT) is the trained responder to treat the injured persons.
A bandage is a material which is used to keep the dressing in its place to control the bleeding but not to interfere with the blood circulation.
Bandages are of many types like Adhesive tapes, Self-adherent, Triangular bandage and other bandages.
Tourniquets are the device used by the professional which could limit the flow of blood but does not stop the circulation. EMT does not use the Tourniquets to treat the wounds.
Thus, Option-B is the correct answer.
Is a system that connects with skeletal muscle v<span>oluntary controls the body movements. </span>
