anonymous
  • anonymous
*Fan and Medal* {Study Guide for Anatomy and Physiology} Epidermis (outer layer) General function - Tough and resilient, protection is the number one job. Why is the epidermis water resistant? - Function of stratum layers - Role of melanocytes and melanin - Function of Merkel cells -
Health Sciences
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
Do you understand this?
anonymous
  • anonymous
Asking help on a study guide isn't considered cheating, is it?
texaschic101
  • texaschic101
um....water proof for protection...helps prevent water loss ?? The epidermis is made of several specialized types of cells. Almost 90% of the epidermis is made of cells known as keratinocytes. Keratinocytes develop from stem cells at the base of the epidermis and begin to produce and store the protein keratin. Keratin makes the keratinocytes very tough, scaly and water-resistant. stratum layers and function : The deepest layer of the epidermis, the stratum basale, is a single layer of cells resting on a basement membrane (layer between the dermis and epidermis). The stratum basale cells divide continuously. As new cells form, older ones are pushed toward the skin surface. The epidermis does not have a direct blood supply; all nutrients that feed these cells come from the dermis. Only the deepest cells of the stratum basale receive nourishment. The cells that are pushed away from this layer die. When the cells reach the skin surface, they are sloughed off in a process called desquamation. The next layer, the stratum spinosum, consists of spiny wingspanle cells that interlock to support the skin. The stratum granulosum, the thin middle layer, initiates keratinization (production of keratin). This process starts the death of epithelial cells (the cell type that makes up skin). During desquamation, keratinocytes are pushed toward the surface. These cells begin to produce the keratin that eventually will dominate their contents. When these cells reach the epidermis outer layer, they are little more than keratin-filled sacs. Millions of these dead cells are worn off daily, creating a new epidermis every 35 to 45 days. The stratum lucidum protects against sun ultraviolet-ray damage. This thick layer appears only in frequently used areas such as palms of the hands and soles of the feet. Thick skin epidermis has all five strata. Thin skin covers thinner epidermal areas such as eyelids. Thin skin has three or four of the five strata; it never has stratum lucidum. The stratum corneum, the fifth, outermost layer is thick with rows of dead cells. These cells contain soft keratin, which keeps the skin elastic and protects underlying cells from drying out. role of malenocytes and melanin -- Melanocytes are the cells that are responsible for producing the pigment melanin, which gives color to skin and hair function of merkel cells -- A Merkel cell is a touch receptor found in the skin. Merkel cells, or Merkel-Ranvier cells, are involved in the sensation of light touch, for example when feeling the texture of an object or determining its shape using the fingertips

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anonymous
  • anonymous
@texaschic101 Thank you

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