104 Chapter Six Integument 22. Contrast the Junction in thick skin the versus th
ID: 3508986 • Letter: 1
Question
104 Chapter Six Integument 22. Contrast the Junction in thick skin the versus thin skin. I is there a difference in the number of dermal papilse? What tunction do you sink such fference with thet of nohe the structure of the epidermadermal junction nc 23. Why is it important that melanin is present in its highest concentration in the k ratinocytes at or near the basal layer of celis? Hint: Ware cels that were undergoing cell division observed in this lnyer?) 24. a What is the advantage of having tactile (Meissner) corpuscles located near the surface of the skin? the palm of the hand or in the sikin on the back b. Do you think there would be more of these sensory receptors per unit area in the skin on (or would they be the same)?Explanation / Answer
22. Thick skin has epidermis with a thick outer layer of keratin, high dermal papillae enhance adhesion of dermis and epidermis, ridges and grooves are present which are responsible for fingerprints contains numerous sweat glands.
- Thin skin has thinner epidermis and keratin layer, contains hair follicles, and has fewer sweat glands and no ridges and grooves.
23.
Keratinocytes mostly occur in high concentrations in the basal layer of skin known as stratum basale. It is the main physical barrier for the entry of pathogens such as bacteria, fungi and viruses. The keratinocytes produce proinflammatory cytokines, leukocytes and defensins that protect from pathogenic organisms. The keratinocytes interact with melanocytes and protect the body from ultraviolet radiation that damages the skin. The melanocytes produce melanin that collects in the keratinocytes in the perinuclear area and forms a supranuclear cap to protect from damage of DNA by UV rays.
24.
a. Tactile corpuscles are mechanoreceptors. They are accumulated nerve endings in the skin that respond to the sense of a light touch. These are rapid active receptors that occur mostly in hairless skin like that of finger pads.
b. The tactile corpuscles though are distributed throughout the skin they are more sensitive in the areas of fingers and lips even to a light touch. They mostly occurs in glabrous skin just beneath the epidermis within the dermal papillae
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