#1
What is the most abundant cell type that produces a protein that gives the epidermis its protective properties.
Keratinocyte
What are the layers of the skin from deep to superficial?
Stratum Basale
Stratum Spinosum
Stralum Granulosum
Stratum Lucidum
Stratum Corneum
True or False Melanin clusters on the basale side of keratinocytes.
False
The hypodermis is also known as?
Subcutaneous layer and Superficial Fascia.
Arrector pili muscle is made of what type of muscle?
True or False the Arrector PilI Muscle runs from the most deep part of the dermis to a deep—lying hair follicle.
Smooth Muscle
False it runs from the most superifcial part of the dermis to a deep-lying hair folicle.
What is the spider-shaped cell found only in the stratum basale.
Melanocytes
In mammals sweat glands are used for what?
True or False you lose 50 mL of sweat per day.
Thermoregulation
False its 500 mL
At the proximal end of the nail body, the bed thickens to form what?
What is the most distal end of the nail?
The Nail Matrix
Free Edge
Which is sweat gland is made of true sweat?
What is true sweat made out of and how is it released?
Eccrine glands
99% water and 1% salt and it is sectreted thru exocytosis.
_____ is a knot of sensory nerves around hair bulb…
bending of the hair stimulates nerve endings.
_____ are tubular invaginations of the epidermis from which the hairs grow.
Root Plexus
Hair Follicles
What are the hemisphere shaped cells that are receptors for touch
Where do women first accumulate fat?
Where do men first accumulate fat?
Thighs and Breast
Anterior part of the abdomen
Which connective tissues is present in the hypodermis and which is the most abundant?
NO
Both areolar and adipose are present in the hypodermis although adipose is the more abundant C.T.
_____ are the fingerlike projections that extend into the overlying epidermis.
Dermal Papillae
What layer of the dermis is made of collagen fibers?
What layer of the dermis is made of areolar C.T.?
Reticular Layer
Papillary Layer
What is part of the body is considered the Hide?
Dermis
What are your two vascular plexuses?
They both play a role in what?
Subpapillary plexus and Cutaneous Plexus
Thermal regulation
How do sebaceous glands make sebum And where are they found?
True or False are make of simple tubular glands?
Holocrine Secretion
False they are made of simple alveolar glands.
True or False: Melanin is made from an amino acid called tyrosinase.
True or False Melanocytes contain an enzyme called tyrosine.
False
False
True or False Keratinocytes are connected to one another by tight junctions.
True or False: Keratinocytes also produce amino acids and enzymes that detoxify harmful chemicals.
False: Desmosomes
False they produce ANTIBODIES and enzymes to detoxify harmful chemicals.
What layer of cells contain thick bundles of intermediate filaments, called tonofilaments
Stratum Spinosum
What layer resembles flat sacs filled with keratin because their nuclei and organelles disintegrated upon death.
True or False the stratum granulosum contains keratohyaline granules which produces a water proofing glycolipid to prevent water loss?
Stratum Corneum
False Lamellated Granules contain the waterproofing glycolipid in the stratum granulosum.
True or False Melanin passes from melanocytes to keratinocytes in the stratum basale of the epidermis.
True. Recall: Your youngest keratinocytes are in your stratum Basale and so are you melanocytes.
True or False the epidermis is composed of avascular epithelium (stratified squamous)
True
What are all the functions of the skin? (8)
-Protects the body from bumps, scrapes, and cuts
-Screens out harmful UV rays from the sun
-Metabolic duties…Synthesis of vitamin D
-Insulates/cushions underlying body tissues
-Protects the body from water loss
-Helps regulate body temperature
-Excretes wastes (urea, salt)
-Contains sense organs