24) Nail production occurs at the nail... A. body B. bed C. root D. cuticle E. l

Question

24) Nail production occurs at the nail... A. body B. bed C. root D. cuticle E. lunula 25) Which of the following functions in storing fat, providing insulation, and protecting various structures by padding them? A. glandular tissue B. vascular tissue C. osseous tissue D. adipose tissue E. reticular tissue 26) Which of the following cell types is responsible for producing mucus? A. squamous B. goblet C. keratinized D. blast E. mast 27) The reduction of friction between parietal and visceral surfaces of a cavity is the function of.. A. mucous membranes B. serous membranes C. cutaneous membranes D. synovial membranes E. none of these choices are correct 28) The vitamin necessary for the replacement of epithelial tissues is: A. vitamin A B. vitamin B C. vitamin C D. vitamin D E. vitamin K 29) Some exposure to the sun is beneficial because sunlight converts a steroid (cholesterol) into A. melanin B. vitamin D C. sebum D. carotene E. none of these choices are correct

Explanation / Answer

24. Nail production occurs at an epithelial fold called nail root. The nail rood is the base of the nail underneath the skin. It originates from actively growing tissue called epithelial cells. So option 'C' Root is the correct answer.

25. The adipose tissue stores fat, provides insulatory, protects various structure by padding them. It also helps in heat production to protect our body from cold. So option 'D' Adipose tissue is the correct answer.

26. Goblet cells are responsible for production of mucus. These cells are present in the airways like trachea, broncus, nasal cavity, and food pipe (Esophagus) etc. So option 'B' Goblet cells is the correct option.

27. Serous membrane reduces friction between parietal and visceral surfaces of a cavity. It secretes fluid called serous fluid. It is collected on microvilli on the outer layer and acts as a lubricant and reduces friction between parietal and visceral surfaces. So option 'B' Serious membrane is the correct answer.

28. Normal mucus secreting cells of epithelium become replaced by stratified , keratinized epithelium when vitamin A is deficient. The epithelial cell from deficient of vitamin - A fail to differentiated to mucus secreting cells and mesenchymal cells fail to differentiate beyond the blast stage. So, option 'A' Vitamin-A is the correct.

29. The cholesterol on exposure to the sun light converted into vitamin-D. In this process a form of 7-dehydrocholesterol found in the skin absorbs the UVB radiation and gets converted into cholecalciferol. It is previtamin form of D3. So option 'B' Vitamin-D is the correct answer.

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