Multiple ChoiceMore than one choice may apply.In investigating the cause of thinning hair, which of the following questions needs to be asked?a. Is the diet deficient in proteins?b. Is the person taking megadoses of vitamin C?c. Has the person been exposed to excessive radiation?d. Has the person recently suffered severe emotional trauma?

Why don't you bleed when you cut your nails? Why don't you bleed when a hair is pulled?

Manufacturers of shampoos and conditioners often claim their products contain vitamins that are necessary to keep hair shafts healthy. Do hair shafts need vitamins? (Hint: Vitamins are required for cells to carry out certain reactions.) Why or why not? How valid are these claims?

The hair and nails are sometimes called accessory organs. Are these structures technically organs? Why or why not?