WGU D312 integumentary system: -Questions with
100% correct answers
What are the two main layers of the skin?
The epidermis and dermis.
What is the outermost layer of the epidermis made of?
Keratinized stratified squamous epithelium.
What is the primary function of the epidermis?
Provides overall protection and is avascular (no blood vessels).
What are the layers of thin skin from deep to superficial?
Stratum basale, stratum spinosum, stratum granulosum, stratum corneum.
What additional layer is present in thick skin?
Stratum lucidum.
What does the dermis contain?
Blood vessels, lymph vessels, nerves, hair follicles, and sweat glands.
What are the two layers of the dermis?
The papillary layer and the reticular layer.
What type of tissue makes up the papillary layer of the dermis?
Loose areolar connective tissue.
What is the function of Meissner corpuscles?
,They are touch receptors that respond to light touch.
What type of tissue is the reticular layer of the dermis made of?
Dense irregular connective tissue.
What is the hypodermis also known as?
The subcutaneous layer or superficial fascia.
What is the primary function of the hypodermis?
Fat storage, insulation, and cushioning for the skin.
What pigments influence skin color?
Melanin, carotene, and hemoglobin.
What are the two primary forms of melanin?
Eumelanin (black and brown) and pheomelanin (red).
How does UV exposure affect melanin production?
It stimulates melanocytes to produce more melanin, which protects DNA from damage.
What is the role of hemoglobin in skin color?
It carries oxygen in red blood cells, giving light-skinned individuals a pink hue.
What is carotene and where is it stored?
A precursor to vitamin A, stored in the dermis and hypodermis, producing a yellow-orange color.
What are the protective functions of the skin?
, Protects against elements, water loss, microbes, and chemical exposure.
How does the skin contribute to thermoregulation?
Through sweat production and dilation/constriction of dermal arterioles.
What sensations are detected by the skin?
Touch, pressure, vibration, tickle, temperature, and pain.
What waste products can be excreted through the skin?
Water, salts, urea, ammonia, and CO2.
How is vitamin D synthesized in the skin?
When the epidermis is exposed to UV radiation, it synthesizes vitamin D3 from cholesterol.
What conditions can arise from a lack of vitamin D?
Rickets in children and osteomalacia in the elderly.
What is the significance of the skin's role in immunity?
It helps protect against bacterial, viral, and fungal infections.
What happens to melanosomes after they are formed?
They are eventually destroyed by fusion with lysosomes and are shed with the stratum corneum.
What can excessive UV exposure lead to in terms of skin changes?
Freckles and moles, which can potentially be cancerous.
What are the four main cell types found in the epidermis?
100% correct answers
What are the two main layers of the skin?
The epidermis and dermis.
What is the outermost layer of the epidermis made of?
Keratinized stratified squamous epithelium.
What is the primary function of the epidermis?
Provides overall protection and is avascular (no blood vessels).
What are the layers of thin skin from deep to superficial?
Stratum basale, stratum spinosum, stratum granulosum, stratum corneum.
What additional layer is present in thick skin?
Stratum lucidum.
What does the dermis contain?
Blood vessels, lymph vessels, nerves, hair follicles, and sweat glands.
What are the two layers of the dermis?
The papillary layer and the reticular layer.
What type of tissue makes up the papillary layer of the dermis?
Loose areolar connective tissue.
What is the function of Meissner corpuscles?
,They are touch receptors that respond to light touch.
What type of tissue is the reticular layer of the dermis made of?
Dense irregular connective tissue.
What is the hypodermis also known as?
The subcutaneous layer or superficial fascia.
What is the primary function of the hypodermis?
Fat storage, insulation, and cushioning for the skin.
What pigments influence skin color?
Melanin, carotene, and hemoglobin.
What are the two primary forms of melanin?
Eumelanin (black and brown) and pheomelanin (red).
How does UV exposure affect melanin production?
It stimulates melanocytes to produce more melanin, which protects DNA from damage.
What is the role of hemoglobin in skin color?
It carries oxygen in red blood cells, giving light-skinned individuals a pink hue.
What is carotene and where is it stored?
A precursor to vitamin A, stored in the dermis and hypodermis, producing a yellow-orange color.
What are the protective functions of the skin?
, Protects against elements, water loss, microbes, and chemical exposure.
How does the skin contribute to thermoregulation?
Through sweat production and dilation/constriction of dermal arterioles.
What sensations are detected by the skin?
Touch, pressure, vibration, tickle, temperature, and pain.
What waste products can be excreted through the skin?
Water, salts, urea, ammonia, and CO2.
How is vitamin D synthesized in the skin?
When the epidermis is exposed to UV radiation, it synthesizes vitamin D3 from cholesterol.
What conditions can arise from a lack of vitamin D?
Rickets in children and osteomalacia in the elderly.
What is the significance of the skin's role in immunity?
It helps protect against bacterial, viral, and fungal infections.
What happens to melanosomes after they are formed?
They are eventually destroyed by fusion with lysosomes and are shed with the stratum corneum.
What can excessive UV exposure lead to in terms of skin changes?
Freckles and moles, which can potentially be cancerous.
What are the four main cell types found in the epidermis?
