Flashcards in Ch. 5 Integumentary System Deck (39):
What are the two layers of the skin?
Epidermis and dermis
What is underneath the dermis?
The hypodermis (or subcutaneous layer)
What is the epidermis composed of?
Keratinized stratified squamous epithelium
Describe stratum basale and its function?
Its a single row of cubical epithelium and it produces new cells through cell division
What is the function of keratin?
It toughens skin
What produces melanin?
List characteristics of dermis.
Second deeper layer
Alive layer of skin
Divided into 2 parts (papillary & reticular)
What is the papillary region made up of?
Connective tissue w/collagen and elastic fibers
What is the reticular region?
Dense connective tissue, collagen bundles, adipose cells, hair follicles
What are sudoriferous glands?
Ceruminous glands produce?
What is the inability to make pigment?
What is vitiligo?
The loss of melanin
Describe shaft of hair.
Its the portion that is out of the skin
What is the root of hair?
The part that is firmly in the skin
What is a hair follicle?
The root and all of the surrounding tissue in the skin
What is the portion of the hair where blood vessels enter?
Explain the arrector pili.
The muscle that attaches to the root, autonomic control
Where are the sebaceous glands released?
Out onto the shaft
Describe the growth of hair.
There is a resting stage 15% of the time and a growing phase 85% of the time
Name and describe the types of sudoriferous glands.
Eccrine sweat glands that help regulate body temperature
Apocrine sweat glands "nervous sweat" excitement, axilla and groin
Mammary gland-modified to produce milk instead of sweat
The hypodermis is also known as....
The subcutaneous layer
How many functions are there of the skin?
Explain the protection function of the skin.
The skin is protected by water, bacteria, and uv light waves
What is thermoregulation?
Cools the skin when hot and holds temp when cold
Which function of the skin involves water and salt?
What are cutaneous sensations involving the skin?
Touch, pressure, vibration, pain, temp, itch, tickle
What does the skin absorb?
Gases O2 and CO2, drugs, fat soluble vitamin (A, D, E, K)
What is involved in synthesis of Vitamin D?
Precursor is activated in synthesis process
What type of skin is all over the body except palms, digits, and soles?
What areas does the thick layer of skin cover?
Palms, digits, soles, dermal papillae deeper and more numerous
What are the four steps in wound healing?
Inflammation, migration, proliferation, and maturation
What is the inflammatory phase?
Fills in hole, plugs it, and stops bleeding
What happens in the migratory phase?
Cells come to work, fibroblasts, macrophages
Describe proliferative phase.
Cells fill in wound and dissolve inflammatory stuff
What is remodeled new skin?