BIOS251-EXAM 3(WEEK 5-INTEGUMENTARY)
QUESTIONS WITH CORRECT ANSWERS 2025
structure of skin CORRECT ANSWER epidermis
- dermis
- subcutaneous layer (hypodermis)
accessory structures CORRECT ANSWER - sweat glands
- oil (sebaceous) glands
- hair
- nails
functions of skin CORRECT ANSWER
1. protection: against dehydration & infection (includes acid mantle, keratin, antimicrobial peptides)
2. synthesis of vitamin D: contributes to bones
3. sensation: skin is largest sense organ: tactile, thermal, pain
4. thermoregulation: regulating body temp in cold & hot environment, sweat & evaporation
5. nonverbal communication: expressive faces, general appearance of skin/hair
what cells make epidermis? CORRECT ANSWER 1. stratified squamous epithelium
2. keratinocytes
3. melanocytes
4. langerhans cells
5. merkel cells
dermis CORRECT ANSWER - composed of collagen, elastic, and reticular fibers
- blood vessels & nerve endings, cutaneous glands, hair follicles, hair roots
- forms fingerprints
- cutaneous membrane: dermis + epidermis
- dermal papilla
, - papillary layer
- reticular layer
- blisters
papillary layer CORRECT ANSWER most superficial layer of the dermis
- made of areolar tissue
- rich in blood supply
reticular layer CORRECT ANSWER deeper, thicker layer of dermis
- dense irregular tissue, collagen & elastic fibers
- hair follicles, hair roots, nerve endings, cutaneous glands
- produces stretch marks due to collagen fibers tearing
blisters CORRECT ANSWER
form as a result of fluid seeping out of blood vessels, accumulating btw epidermis and dermis
subcutaneous layer (hypodermis) CORRECT ANSWER
consists of loose connective tissue (adipose, areolar)
- well-vascularized
- connects skin to fascia beneath it
- provides insulation, stores fat
keratinocytes CORRECT ANSWER - 90% of epidermal cells
- produce keratin-toughens and protects skin
- produces granules for water-proofing, prevents entry of pathogens
melanocytes CORRECT ANSWER - produce melanin pigment
- stratum basale
- long slender projections connect w keratinocytes, melanin shuttled there
QUESTIONS WITH CORRECT ANSWERS 2025
structure of skin CORRECT ANSWER epidermis
- dermis
- subcutaneous layer (hypodermis)
accessory structures CORRECT ANSWER - sweat glands
- oil (sebaceous) glands
- hair
- nails
functions of skin CORRECT ANSWER
1. protection: against dehydration & infection (includes acid mantle, keratin, antimicrobial peptides)
2. synthesis of vitamin D: contributes to bones
3. sensation: skin is largest sense organ: tactile, thermal, pain
4. thermoregulation: regulating body temp in cold & hot environment, sweat & evaporation
5. nonverbal communication: expressive faces, general appearance of skin/hair
what cells make epidermis? CORRECT ANSWER 1. stratified squamous epithelium
2. keratinocytes
3. melanocytes
4. langerhans cells
5. merkel cells
dermis CORRECT ANSWER - composed of collagen, elastic, and reticular fibers
- blood vessels & nerve endings, cutaneous glands, hair follicles, hair roots
- forms fingerprints
- cutaneous membrane: dermis + epidermis
- dermal papilla
, - papillary layer
- reticular layer
- blisters
papillary layer CORRECT ANSWER most superficial layer of the dermis
- made of areolar tissue
- rich in blood supply
reticular layer CORRECT ANSWER deeper, thicker layer of dermis
- dense irregular tissue, collagen & elastic fibers
- hair follicles, hair roots, nerve endings, cutaneous glands
- produces stretch marks due to collagen fibers tearing
blisters CORRECT ANSWER
form as a result of fluid seeping out of blood vessels, accumulating btw epidermis and dermis
subcutaneous layer (hypodermis) CORRECT ANSWER
consists of loose connective tissue (adipose, areolar)
- well-vascularized
- connects skin to fascia beneath it
- provides insulation, stores fat
keratinocytes CORRECT ANSWER - 90% of epidermal cells
- produce keratin-toughens and protects skin
- produces granules for water-proofing, prevents entry of pathogens
melanocytes CORRECT ANSWER - produce melanin pigment
- stratum basale
- long slender projections connect w keratinocytes, melanin shuttled there
