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Chapter 5 (Kahoot (The dermis is composed largely of
dense irregular…
Chapter 5
Kahoot
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When smooth in the walls of dermal blood vessels contract,
body heat is conserved
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Why is vitamin D a misnomer?
vitamin D is not essential as long as we have sufficient exposure to sunlight
Basal cell Carcinoma-
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-seen on lips, ears, head
Squamous cells-
-seen on lips, ears, head
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5-6
Hair follicles
Structure:
a. Hair root or base in deep dermis;b. hair shaft in epidermis
- cuticle outer shingle like layer
- cortex middle layer,flexible soft keratin
- medullainner layer, hard keratin
Growth
a. grows for 2-5 years/ new cycle pushes old hair out
b. 0.3 mm per day
c. 2.5 million on body/500,000 hairs on the head
thin skin-found in most areas of the integumentary system, with an epidermis consisting of four layers of keratinocytes
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5-4
dermal papillae**-a fingerlike projection of the dermis that may contain blood capillaries or Meissner corpuscles (of touch)
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5-5
apocrine sweat (sudoriferous) gland-found in the skin of the axilla, groin, and areolae; secretes a viscous, lipid- and protein-rich product into a hair follicle upon stimulation during emotional distress or sexual excitement
epidermis-the superficial, thinner layer of skin, composed of keratinized stratified squamous epithelium
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Hypodermis (subcutaneous layer)-a continuous sheet of areolar connective tissue and adipose tissue between the dermis of the skin and the deep fascia of the muscles
stratum basale-the deepest layer of the epidermis consisting of stem cells capable of undergoing cell division to form new cells
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stratum lucidum-found only in the THICK SKIN of the fingers, palms, and soles
stratum corneum-the most superficial layer of the epidermis consisting of up to 30 LAYERS of dead cells
dermal papillae-a fingerlike projection of the dermis that may contain blood capillaries or Meissner corpuscles (of touch)
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