Chapter 1: Cell cyle Flashcards
What provides a natural covering for the human body?
Skin
What are the layers of the skin?
- epidermis
- dermis
What are the cell layers of the epidermis?
1) stratum corneum (outer most layer)
2) keratinocytes (lining cells, middle layer)
3) basal layer (the innermost layer)
Properties of stratum corneum?
- layer of dead cells
- constant shedding
- thickest at the soles of feet and palms.
Properties of keratinocytes?
- composed of living cells
- layer is gradually pushed upwards
- the outer most region is of dead cells
- is the thickest layer
Properties of basal layer?
- constantly dividing stem cells.
- production of keratinocyte cells
- for every division one cell becomes a new keratinocyte cell, the other replaces the stem cell
- cell division causes the layer to be compressed and pushed upwards
- the presence of melanocyte cell (pigment producing cells)
Which part of the skin does the dermis form?
Dermis lies below the epidermis.
Properties of dermis?
- blood vessels
- hair follicles
- sweat glands
- touch sensitive cells
- pain sensitive cells
- muscle fibres
- collagen fibres
Define first-degree burns
The least severe burn damage, that only involves the epidermis of the skin. Eg. Sunburns
Define second-degree burns
Severe burns that involves the epidermis and the upper section of the dermis. Eg. Scalds.
Define third-degree burns
Severe burns that completely destroyed the epidermis and all or part of the dermis.
Skin grafts
A method of covering burns by attaching a healthy skin from an uninjured portion of the body.
Disadvantages of skin draft
- People with severe burns over a wide area will have to cut out an equally large sized healthy skin from the body to cover it.
- if the burns cover over 50°/. of the body, there is not enough autograft to covet it.
Autograft
The healthy piece of skin taken from an undamaged area of the body for skin graft.
Allograft
the healthy and undamaged skin of another person that is being used for skin grafting
