PVCC BIO 141 Integumentary System – Lecture Questions with Answers
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PVCC BIO 141 Integumentary System – Lecture
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PVCC BIO 141 Integumentary System – Lecture
PVCC BIO 141 Integumentary System – Lecture Questions with Answers
Squamous Cell Carcinoma - Answer--Second most common
-Arises from keratinocytes from stratum spinosum
-Metastasize (spread)
-irregular pink ulcer w/ raised edge
-Managed by surgical removal
-Prognosis good - if treated earl...
PVCC BIO 141 Integumentary System
– Lecture Questions with Answers
Squamous Cell Carcinoma - Answer--Second most common
-Arises from keratinocytes from stratum spinosum
-Metastasize (spread)
-irregular pink ulcer w/ raised edge
-Managed by surgical removal
-Prognosis good - if treated early
Malignant Melanoma - Answer--Will kill you
-Sometimes hidden (most dangerous!)
-Cancer of the melanocytes (ie moles)
-Metastasize (spread) early on
-Early detection is very important
skin cancer - Answer-most cases caused by UV rays of the sun damaging the skin cell
DNA
-most often on head, neck &
hands
-most common in fair-skinned people and the elderly
-one of the most common & easily treated cancers
-has one of the highest survival rates if detected and treated early
4 layers of the epidermis deep to superficial - Answer-Stratum Corneum
Stratum Granulosum
Stratum Spinosum
Stratum Basale
2 layers of the Dermis - Answer-Papillary & Recitular layer
Skin color is determined by three pigments: - Answer-melanin, hemoglobin, and
carotene.
melanin - Answer--most prominent skin pigment
-secreted by melanocytes
-taken up by keratinocytes to absorb UV radiation (protects against sun rays)
-the amount produced is determined by geographic ancestry and sun exposure
-reddish-yellow to brownish-black pigment
-freckles and pigmented moles,result from local accumulations of this pigment
carotene - Answer--yellow (to orange) pigment
-found in egg yolks and a variety of vegetables (carrots)
, -in diets high in this substance, it can become concentrated in the keratinocytes of the
stratum corneum and hypodermis
-most obvious in the palms and soles of the feet
hemoglobin - Answer--pinkish-red pigment
-found in RBCs (O2 carrying molecule)
-responsible for the pinkish hue of the skin
-only prominent in lighter skin tones
- Great protection against skin cancer
- Sufficient protection against folic acid destruction
- Too little vit. D produced; problem - Answer-Dark skin pigmentation in certain latitudes
can cause these 3 things.
- Poor protection against skin cancer
- Poor protection against folic acid destruction
- Sufficient vit. D produced; benefit - Answer-Light skin pigmentation in certain latitudes
may cause these 3 things.
What are 6 integument functions? - Answer-1-Resistance to trauma & infection (keratin
- toughens, dermacidin & defenses-antimicrobial secretions; acid mantle -acidic
secretions)
2 - Other barrier functions (water, UV radiation, harmful chemicals)
3-Vitamin D synthesis (skin carries out first step; liver/kidneys complete process)
4-sensation (extensive sense organ, receptors for temperature, touch, pain)
5-Thermoregulation (thermoreceptors, vasoconstriction (produces pale
skin)/vasodilation (red/flushed skin))
6-nonverbal communication (facial expression, importance in social acceptance and self
image)
Skin thickness ranges from____ to ___. - Answer-0.5 - 6 mm
Thick skin - Answer-covers front of hands, bottoms of feet
-has high concentration of sweat glands, but no hair follicles or sebaceous (oil) glands
-epidermis is 0.5 mm thick
Thin skin - Answer-covers the rest of body (not palms or soles)
-possesses hair follicles, sebaceous and sweat glands
-epidermis is 0.1 mm thick
Five types of cells of the epidermis - Answer-1-stem cells
2-keratinocytes
3-melanocytes
4-tactile cells (merkel cells)
5-dendritic cells
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