Epithelial Tissue
Which of the following is NOT a feature of epithelial tissue?
a. lines all body surfaces
b. excitable tissue
c. avascular
d. cells tightly packed/very little matrix
b. excitable tissue
Describe the function of tactile cells.
touch receptors
Why does the dermis have dermal papillae and complementary epidermal ridges?
prevent slippage of epidermis and increase sensitivity
Which degree of burns requires a skin graft because it reaches all three layers?
third degree; goes through epidermis, dermis, and hypodermis
Which layer of the epidermis is only found in thick skin such as the palms of your hands and the soles of your feet?
stratum lucidum
What are two types of epithelial tissue whose function is absorption and secretion?
simple cuboidal epithelium
simple columnar epithelium
Which cells are only found in the stratum basale?
stem cells and melanocytes
These receptors sense deep pressure in the reticular layer.
lamellar corpuscles
A sunburn is an example of what type of burn?
first degree
This layer undergoes constant mitosis.
stratum basale
What type of epithelial tissue makes up the epidermis?
keratinized stratified squamous epithelium
What is the difference between keratinocytes and melanocytes?
keratinocytes make keratin; melanocytes make melanin (use the names!)
True or False: Apocrine sudoriferous glands have ducts that lead to a hair follicle.
true!
Which type of skin cancer can metastasize to lymph nodes?
squamous cell carcinoma
Which type of connective tissue binds tissues together and resists mechanical stress? (Hint: The fibers in this tissue type look messy.)
irregular
What does it mean if a surface is not keratinized? What differs about its location in the body?
not keratinized means no dry surface; this means nonkeratinized epithelia will be found in openings to the exterior (mouth, nose, etc.)
What is the function of melanin?
absorb UV radiation
What is the function of ceruminous glands?
waterproof and protect ear canal/eardrum
This skin cancer is rare but fatal if it metastasizes.
malignant melanoma
True or False: Fibrocartilage is the strongest, most rigid cartilage.
Name the two ways epithelial tissues are classified.
number of cell layers and cell shape (what does simple/pseudostratified/stratified mean?)
True or False: In people with darker skin, the number of melanocytes is 10x greater than in people with lighter skin.
false! the number is the same, but the amount of melanin differs
What type of hair is on a fetus?
downy
This skin cancer originates in the stratum basale.
basal cell carcinoma
Which intercellular junction resists mechanical stress and holds cells together? It can be compared to a 'snap.'
desmosomes