A&P - CH. 5 (5.1-5.3)

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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


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