Chapter 6 Flashcards
Function of the Integumentary System
Protection, Regulates body temperature, Synthesis of vitamin D, Detecting stimuli from the environment, and and Excretion of wastes through sweat
Layers of Skin
Epidermis- stratified squamous epithelial tissue
Dermis- dense fibrous connective tissue with collagen and elastic fibers
Subcutaneous Layer or Hypodermis- connective tissue and adipose tissue
Epidermis (5 layers)
Stratum Basale
Stratum Spinosum
Stratum Granulosum
Stratum Lucidum
Stratum Corneum
Keratin
Keratin is produced by Keratinocytes. And is developed when the dead cells are pushed upward toward the top of the skin.
Function of Hair
Protection- scalp from injury and sun rays/ eyebrows and eyelashes protect eyes
Structure of Hair
Shaft- protrudes above skin’s surface
Root- located deep in dermis
Follicle- surrounds the root/ contains blood vessels to provide nourishment
Arrector Pili
A muscle associated with the follicle. When the muscles contract it produces “goose bumps” and makes the hair stand on end.
Function of Nails
Protects ends of fingers and toes
Structure of Nails
Root- covered by skin
Body- composed of dead/highly keratinized cells
Sebaceous Glands
produces an oily substance called Sebum.
Function of Sebum
Keeps hair from drying and becoming brittle/ forms protective film that prevents excessive water loss from the skin by evaporation
Sweat Glands (Sudoriferous Glands)
Eccrine- most common type of sweat gland/ produces a sweat to help regulate the body temperature
Apocrine- associated with hairs in armpits and genitals/ secretes a thick, sticky discharge
Thermoreceptors
Receptors in the body designed to detect changes in body temperature. Because of these sensors if the body is hot it will sweat and if the body is cold it will shiver.
Skin Cancer
Squamous Cell
Basal Cell
Melanoma
ABCDE
