BIO 168 MIDTERM EXAM QUESTIONS
VERIFIED CORRECT SOLUTIONS NEW
UPDATE EXAM WITH CORRECT
QUESTIONS AND ANSWERS 2025
• Skin layers from top to bottom - CORRECT-ANSWERSStratum corneum, Stratum
lucidem, Stratum granulosum, Stratum spinosum, Stratum basale
• Epidermis (surface) - CORRECT-ANSWERSkeratinized, stratified squamous epithelium,
made of keratinocytes - produce fibrous protein keratin and also made of melanocytes
that produce melanin, epidermal dendritic cells (Langerhans) and tactile cells (Merkel)
• Dermis (middle) - CORRECT-ANSWERSstrong, flexible connective tissue that is made
mostly of fibroblasts and macrophages as well as occasionally mast cells and WBCs, 2
layers - thin papillary layer (vascular) and thicker reticular layer (strength)
• Hypodermis (deep) - CORRECT-ANSWERSsubcutaneous layer, mostly adipose tissue
• What gives us our skin color? - CORRECT-ANSWERSmelanin - yellow to reddish-brown to
black pigments give diversity to skin colors
• What are the four appendages of the skin? - CORRECT-ANSWERShairs and hair follicles,
nails, sweat glands and oil glands
, • What is the function of the hair appendage? - CORRECT-ANSWERSalerting the body to
the presence of insects on skin, guarding scalp against trauma, heat loss and sunlight
• What is the function of the nails appendage? - CORRECT-ANSWERSprotect the end of
fingers/toes from injury, allow ability to pick up objects, support tips
• What is the function of the sweat glands appendage? - CORRECT-ANSWERSapocrine -
sexually stimulated scent glands, eccrine - most common sweat gland,
thermoregulation, mammary glands in females secrete milk (modified apocrine)
• What are the functions of skin? - CORRECT-ANSWERSProtection, body temperature
regulation, cutaneous sensation, metabolic functions, blood reservoir, excretion
• Basal cell carcinoma - CORRECT-ANSWERSstratum basale cells proliferate and slowly
invade dermis and hypodermis, least malignant, most common
• Squamus cell carcinoma - CORRECT-ANSWERSkeratinocytes of stratum spinosum
proliferate forming lesions most often on head
• Melanoma - CORRECT-ANSWERSmelanocytes proliferate and rapidly metastasize, most
dangerous
• What is the ABCD rule? - CORRECT-ANSWERSasymmetry, border irregularity, color,
diameter
VERIFIED CORRECT SOLUTIONS NEW
UPDATE EXAM WITH CORRECT
QUESTIONS AND ANSWERS 2025
• Skin layers from top to bottom - CORRECT-ANSWERSStratum corneum, Stratum
lucidem, Stratum granulosum, Stratum spinosum, Stratum basale
• Epidermis (surface) - CORRECT-ANSWERSkeratinized, stratified squamous epithelium,
made of keratinocytes - produce fibrous protein keratin and also made of melanocytes
that produce melanin, epidermal dendritic cells (Langerhans) and tactile cells (Merkel)
• Dermis (middle) - CORRECT-ANSWERSstrong, flexible connective tissue that is made
mostly of fibroblasts and macrophages as well as occasionally mast cells and WBCs, 2
layers - thin papillary layer (vascular) and thicker reticular layer (strength)
• Hypodermis (deep) - CORRECT-ANSWERSsubcutaneous layer, mostly adipose tissue
• What gives us our skin color? - CORRECT-ANSWERSmelanin - yellow to reddish-brown to
black pigments give diversity to skin colors
• What are the four appendages of the skin? - CORRECT-ANSWERShairs and hair follicles,
nails, sweat glands and oil glands
, • What is the function of the hair appendage? - CORRECT-ANSWERSalerting the body to
the presence of insects on skin, guarding scalp against trauma, heat loss and sunlight
• What is the function of the nails appendage? - CORRECT-ANSWERSprotect the end of
fingers/toes from injury, allow ability to pick up objects, support tips
• What is the function of the sweat glands appendage? - CORRECT-ANSWERSapocrine -
sexually stimulated scent glands, eccrine - most common sweat gland,
thermoregulation, mammary glands in females secrete milk (modified apocrine)
• What are the functions of skin? - CORRECT-ANSWERSProtection, body temperature
regulation, cutaneous sensation, metabolic functions, blood reservoir, excretion
• Basal cell carcinoma - CORRECT-ANSWERSstratum basale cells proliferate and slowly
invade dermis and hypodermis, least malignant, most common
• Squamus cell carcinoma - CORRECT-ANSWERSkeratinocytes of stratum spinosum
proliferate forming lesions most often on head
• Melanoma - CORRECT-ANSWERSmelanocytes proliferate and rapidly metastasize, most
dangerous
• What is the ABCD rule? - CORRECT-ANSWERSasymmetry, border irregularity, color,
diameter
