Exam 3 - BMCC BIO 425 Questions with
correct Answers
Epidermis - correct answers✔✔ - keratinized stratified squamous epithelium
- lacks blood vessels
- surface of the skin
- consists of dead blood cells packed with keratin
Stem cells - correct answers✔✔ found in the deepest layer of the epidermis (the basal layer)
and they divide to give rise to keratinocytes
Keratinocytes - correct answers✔✔ synthesizes keratin
Melanocytes - correct answers✔✔ synthesize black to brown pigment (melanin)
Tactile cells - correct answers✔✔ found in the basal layer of the dermis and are associated
with underlying dermal nerve fiber
Dendritic cells - correct answers✔✔ found in 2 layers of the epidermis, they stand against
toxins, microbes and detect such invaders then alert the immune system
Stratum basale (basal surface) - correct answers✔✔ the lowest layer closest to the dermis,
consists of single layer cuboidal to low columnar cells
, Stratum spinosum - correct answers✔✔ thickest layer of the epidermis in thin skin, several
layers of keratinocytes, dendritic cells are found in this layer, desmosomes hold cells together
in this layer, the cells are also bound together by tight junctions
Stratum granulosum - correct answers✔✔ 3-5 layers of keratinocytes, found more in thick
skin than thin skin
Stratum lucidum - correct answers✔✔ only seen in thick skin
Stratum corneum - correct answers✔✔ consists of 30 layers of dead, scaly, keratinized cells
that form a durable surface layer resistant to abrasion, penetration and water loss
The Dermis - correct answers✔✔ beneath the epidermis, a connective tissue layer composed
of collagen fibers and contains elastic and reticular fibers, fibroblasts, supplied with blood
vessels. cutaneous glands and nerve endings
Dermal papillae - correct answers✔✔ upward waves in the boundary between the dermis
and epidermis
Epidermal ridges - correct answers✔✔ downward waves in the boundary between the dermis
and epidermis
Papillary layer - correct answers✔✔ thin zone of areolar tissue near dermal papillae, loosely
organized for mobility of white blood cells and other defenses against organisms that are
introduced through breaks in the epidermis also rich in red blood cells
Reticular layer - correct answers✔✔ consists of dense irregular connective tissue, less room
for ground substance, clusters of adipocytes (fat cells) are found here
correct Answers
Epidermis - correct answers✔✔ - keratinized stratified squamous epithelium
- lacks blood vessels
- surface of the skin
- consists of dead blood cells packed with keratin
Stem cells - correct answers✔✔ found in the deepest layer of the epidermis (the basal layer)
and they divide to give rise to keratinocytes
Keratinocytes - correct answers✔✔ synthesizes keratin
Melanocytes - correct answers✔✔ synthesize black to brown pigment (melanin)
Tactile cells - correct answers✔✔ found in the basal layer of the dermis and are associated
with underlying dermal nerve fiber
Dendritic cells - correct answers✔✔ found in 2 layers of the epidermis, they stand against
toxins, microbes and detect such invaders then alert the immune system
Stratum basale (basal surface) - correct answers✔✔ the lowest layer closest to the dermis,
consists of single layer cuboidal to low columnar cells
, Stratum spinosum - correct answers✔✔ thickest layer of the epidermis in thin skin, several
layers of keratinocytes, dendritic cells are found in this layer, desmosomes hold cells together
in this layer, the cells are also bound together by tight junctions
Stratum granulosum - correct answers✔✔ 3-5 layers of keratinocytes, found more in thick
skin than thin skin
Stratum lucidum - correct answers✔✔ only seen in thick skin
Stratum corneum - correct answers✔✔ consists of 30 layers of dead, scaly, keratinized cells
that form a durable surface layer resistant to abrasion, penetration and water loss
The Dermis - correct answers✔✔ beneath the epidermis, a connective tissue layer composed
of collagen fibers and contains elastic and reticular fibers, fibroblasts, supplied with blood
vessels. cutaneous glands and nerve endings
Dermal papillae - correct answers✔✔ upward waves in the boundary between the dermis
and epidermis
Epidermal ridges - correct answers✔✔ downward waves in the boundary between the dermis
and epidermis
Papillary layer - correct answers✔✔ thin zone of areolar tissue near dermal papillae, loosely
organized for mobility of white blood cells and other defenses against organisms that are
introduced through breaks in the epidermis also rich in red blood cells
Reticular layer - correct answers✔✔ consists of dense irregular connective tissue, less room
for ground substance, clusters of adipocytes (fat cells) are found here
