Vitamin D Synthesis and Sources Quiz
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Questions and Answers

Vitamin D is not strictly a vitamin since it can be synthesized in the ______

skin

Animal Sources of vitamin D3 include liver, egg yolk, saltwater fish, and vitamin D–fortified ______

foods

Plant Sources include vitamin D2 in ______

plants

7-Dehydrocholesterol, an intermediate in cholesterol synthesis, is converted to cholecalciferol in the dermis and epidermis of humans exposed to ______

<p>sunlight</p> Signup and view all the answers

Vitamins D2 and D3 are not biologically active but are converted in vivo to the active form of the D vitamin: 1,25-Dihydroxycholecalciferol (calcitriol) by two sequential ______ reactions

<p>hydroxylation</p> Signup and view all the answers

There is growing evidence that higher vitamin D status is protective against various ______, including prostate and colorectal cancer

<p>cancers</p> Signup and view all the answers

Deficiency of vitamin D produces ______ in children and osteomalacia in adults

<p>rickets</p> Signup and view all the answers

Rickets is characterized by the formation of soft and pliable bones due to poor mineralization and ______ deficiency

<p>calcium</p> Signup and view all the answers

Osteomalacia is characterized by the ______ of previously formed bones

<p>demineralization</p> Signup and view all the answers

Rachitic children are usually anemic or prone to ______

<p>infections</p> Signup and view all the answers

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