The main source of vitamin D in the human body is （）
A: endogenous D synthesized by skin
B: vitamin D in egg yolk
C: vitamin D in pig liver
D: vitamin D in milk
A: endogenous D synthesized by skin
B: vitamin D in egg yolk
C: vitamin D in pig liver
D: vitamin D in milk
举一反三
- 20. Broccoli _____, can prevent the human body from being damaged by oxidant environment . A: is rich in vitamin C B: rich in vitamin C C: be rich in vitamin C D: are rich in vitamin C
- Whicn vitamin can reduce the curative effect of levodopa() A: vitamin A B: vitamin B1 C: vitamin B2 D: vitamin B6 E: vitamin B12
- Night blindness is mainly caused by lack of( ).() A: Vitamin A B: Vitamin B1 C: Vitamin D D: Vitamin E
- From the conversation, we know （） is very important for good eyesight. A: Vitamin A B: Vitamin B C: Vitamin C D: Vitamin D
- Human body cannot synthesize Vitamin C because the body lacks an enzyme which is needed at the end of the vitamin C biosynthesis pathway, so we must uptake Vitamin C from foods or take some additional supplements.