integumentary Flashcards
-consists of the skin, hair, glands, and nails.
-protects us from the external environment. Other functions include sensation, vitamin D production, temperature regulation, and excretion of small amounts of waste products.
integumentary system
stratified squamous epithelium divided into strata.
epidermis
from deep to superficial are stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
strata
produced in the stratum basale.
new cells
consists of many layers of dead squamous cells containing keratin. The most superficial layers are sloughed.
stratum corneum
the transformation of stratum basale cells into stratum corneum cells.
Keratinization
results from keratin inside the cells and from desmosomes, which hold the cells together.
structural strength
surrounding the stratum corneum cells help prevent fluid loss.
lipids
dense connective tissue.
dermis
provide structural strength, and the blood vessels of the papillae supply the epidermis with nutrients.
collagen and elastic fibers
produce melanin, which is responsible for different skin colors.
melanocytes
production is determined genetically but can be modified by exposure to ultraviolet light and by hormones.
melanin
a plant pigment ingested as a source of vitamin A, can cause the skin to appear yellowish.
carotene
produces a red skin color, whereas decreased blood flow causes a pale skin color.
increased blood flow
results in the blue skin color of cyanosis.
Decreased blood O