Question

14). It is important for the epidermis to be effective at screening UV radiation, but not to be too effective. Explain.

15). Your patient asks you which cell type in the skin is the most important cell and why? How would you reply? Explain.

16). Describe the stages of intramembranous ossification and name at least one (1) bone that is formed using this process.

25). Describe the sequence of injuries to specific tissues that might occur if a patient’s knee receives blunt force trauma to the lateral side of the knee.

Answer 1

14) Ultraviolet radiation to the skin causes a lot of pathology. Sun has a ultraviolet radiation which regularly comes in contact with human skin. The sun has UVA and UVB in that UVA is more dangerous and have a longer wavelength than UVB which can mutate the DNA and cause cancer in human beings so the UV radiation should not be too effective. But the UV radiation is to be effective in screening because the UV radiation travels the skin to reach dermal capillaries for the synthesis of vitamin D which is helpful for bone health maintainencemaintainence.

If the epidermis screens the UV radiation and filters it effectively it may lead to vitamin D deficiency. And if the epidermis screening is weak and allows the excess UV radiation to pass the epidermis then it leads to cancer. So the epidermis should be effective in screening the UV radiation for the synthesis of vitamin D but should not be too effective in screening the UV radiation and that leads to vitamin D deficiency.