10. What is the function of the dermis? 11. What is the tissu? composition of th
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10. What is the function of the dermis? 11. What is the tissu? composition of the dermis? 12. What is the function of the epidermis? 13. What is the tissue composition of the epidermis? 14. How does the skin help to regulate body temperature? 15. List the 5 layers of the epidermis. 16. Mention 2 characteristics of the stratum basal. 17. Mention 2 characteristics of the stratum spinosum. 18. Mention 2 characteristics of the stratum granulosum 19. Mention 2 characteristics of the stratum corneum. 20. Mention 2 cells types found in the epidermis. 21. In what stratum of the epidermis do you find actively mitotic cells? 22. In what layer of the skin do we find blood vessels? 23. What happens to the keratinocytes in the stratum corneumi?Explanation / Answer
10. Dermis holds blood vessels, nerve endings to signal skin injury and inflammation. It provides fibroblasts for wound healing. It also provides mechanical strength with the help of collagen fibers, elastic fibers, and ground substance.
11. Dermis consists of connective tissue mainly comprised of collagen fibers, reticular fibers, reticular fibers, fibroblasts, and macrophages.
12. Functions of epidermis are: (i) protection; it acts as a physical barrier and protects body from physical injury, trauma, chemicals, toxins, microbes, temperature extremes and solar radiation. (ii) prevention of Water Loss. (iii) metabolic regulation. (iv) secretion and absorption. (v) immune functions with the help of dendritic cells which are present in stratum spinosum of epidermis.
13. Epidermis is composed of stratified squamous, keratinized, epithelial cells with no nuclei.
14. Skin regulates body temperature with the help of blood supply and through sweating. Sweating followed by evaporation results in heat loss.
15. Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum.
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