Chapter 6 Review Questions Flashcards
What is the epidermis made up of
Stratified squamous epithelium
What is the dermis made of
Connective tissue containing collagen and elastic fibers, smooth muscle tissue, nervous tissue and blood
What happens to epidermal cells as they undergo keratinization
Older cells thicken and develop desmosomes that fasten them together. These old cells harden through kertinization. Strands of tough fibrous waterproof keratin proteins are synthesize and store in the cell. Resulting in layer of dead cells in the epidermis which are eventually shed
What are specialized cells in the epidermis that produce melanin from the amino acid tyrosine in melanosomes
Melanocytes
What provides skin color
Melanin
Where is melanocytes located
Stratum basale of epidermis
What is a condition in which melanin genes have been mutated
Albinism
What else does melanin do besides skin color
Absorbs ultraviolet radiation in sunlight which would otherwise cause mutations in the DNA of skin cells and damaging effects
What is upper or papillary layer of the dermis composed of
Areolar connective tissue
What is the lower or reticular layer of the dermis made of
Dense irregular connective tissue
What sweat glands that respond to elevated temperature and are commonly found on the forehead neck and back
Merocrine
What is when fluid changes from liquid to a gas
Evaporation
What is when heat moves from body directly into molecule of cooler objects in contact with its surface
Conduction
What is when heat rays escape from warmer surfaces to cooler surroundings
Radiation
What is a continuous circulation of air over a warm surface
Convection
