A&P - CH. 5 (5.1-5.3)
What are 3 sensations detected by the skin?
- pain - temperature - light touch
the most superficial layer of the dermis is the:
papillary layer
where are melanocytes located?
stratum basale of the epidermis
what layer of the epidermis is NOT present in thin skin?
stratum lucidum
what is the primary function of vitamin D?
vitamin D is required for calcium absorption from the small intestine
from superficial to deep, what is the correct order of the layers of the epidermis in thick skin?
- stratum corneum - stratum lucidum - stratum granulosum - stratum spinosum - stratum basale
What are 3 functions associated with the skin?
- thermoregulation - sensation - protectoin
the continual life cycle of keratinocytes being sloughed dand replaced by cells undergoing mitosis takes about:
40-50 days
the majority of cells in the epidermis arise from mitotic activity in stratum __________
basale
keratinocytes in the stratum corneum are _______ and filled with ________
dead; keratin
What cells of the epidermis function as phagocytes of the immune system?
dendritic cells
what tissue composes the reticular layer of the dermis?
dense irregular connective tissue
where are blood vessels housed that nourish the epidermis?
dermal papillae
fibroblasts are associated with what part of the skin?
dermis
we have unique patterns on our fingers, toes, palms, and soles created by:
epidermal ridges
the most superificial component of the skin is the:
epidermis
tommy fell and skinned his knee. the scrape did not bleed. He must have only damaged the:
epidermis
what are the main components of the cutaneous membrane?
epidermis and dermis
which of the following sensations is NOT detected by the skin? a. equilibrium b. pain c. temperature d. light touch
equilibrium
which of the following cells is associated with the dermis? a. fibroblast b. keratinocyte c. melanocyte d. denritic (Langerhans) cell
fibroblast
which of the following cells are assoicated with the dermis? a. fibroblasts b. dendritic cells c. keratinocytes d. melanocytes
fibroblasts
what structure is found in thin skin but NOT thick skin?
hair follicles
which of the following structures is not found in thick skin? a. hair follicles b. stratum lucidum c. sweat glands d. stratum granulosum
hair follicles
What is the main tissue of the epidermis?
keratinized stratified squamous epithelium
what is the mot numerous cell type in the epidermis?
keratinocyte
extreme stretching of the reticular layer of the dermis results in:
permanent stretch marks
the ____________ is the largest organ in the body
skin
the ___________ is a location of thick skin
sole of the foot
the most superficial layer of the epidermis is called the:
stratum corneum
what is the thickest layer of the epidermis?
stratum spinosum
what are the sensory receptors in the dermal papillae that respond to light touch stimuli called?
tactile (Meissner) corpuscles
skin without keratin would be more likely to:
tear upon being mechanically stressed
why do keratinocytes in the superficial strata of the epidermis die?
they are too far away from the blood supply in the dermis
which of the following functions is NOT associated with the skin? a. vitamin A synthesis b. thermoregulation c. sensation d. protection
vitamin A synthesis
