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41 terms

Chapter 7 LAB

The Integumentary System
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The two basic tissues of which the skin is composed are dense irregular connective tissue, which makes up the dermis, and
Stratified squamous epithelium
The tough water repellent protein found in the epidermal cells is called
Keratin
The pigments melanin and ________ contribute to skin color
Carotene
A localized concentration of melanin is referred to as a
Freckle
Four protective functions of the skin are
Insulate and cushion
Protect from mechanical damage
Protect from chemical damage
Protect from heat
Translucent cells in thick skin containing keratin fibrils
Stratum lucidum
Dead cells
Stratum lucidum
Stratum corneum
Dermal layer responsible for fingerprints
Papillary layer
Vascular region
Dermis as a whole
Major skin area that produces derivatives (nails and hair)
Epidermis as a whole
Epidermal region exhibiting the most rapid cell division
Stratum basale
Scalelike dead cells, full of keratin, that constantly slough off
Stratum corneum
Mitotic cells filled with intermediate filaments
Stratum spinosum
Has abundant elastic and collagen fibers
Dermis as a whole
Location of melanocytes and tactile (Merkel) cells
Stratum basale
Area where weblike pre-keratin filaments first appear
Stratum spinosum
Region of areolar connective tissue
Papillary layer
__________ granules extruded from the keratinocytes prevent water loss by diffusion through the epidermis
Lamellated
Fibers in the dermis are produced by
Collagen and elastin
Glands that respond to rising androgen levels are the ___________ glands
Sebaceous
Phagocytic cells that occupy the epidermis are called
Langerhans cells
A unique touch receptor formed from a stratum basale cell and a nerve fiber is a
Tactile or Merkel disc
What layer is present in thick skin but not in thin skin
Stratum lucidum
What cell-to-cell structures hold the cells of the stratum spinosum tightly together
Desmosomes
What substance is manufactured in the skin that plays a role in calcium absorption elsewhere in the body
Vitamin D
List the sensory receptors found in the dermis of the skin
Free nerve endings (pain receptors)
Meissner's corpuscles (touch receptors)
Pacinian corpusles (pressure receptors)
Cyanosis
Blue cast to skin
Lack of blood flow and O2
Bedsore (decubitus ulcer)
Restriction of normal blood supply to the skin in bedridden patients
Bony projections go into skin when they are not turned regularly resulting in tissue death
Produces an accumulation of oily material that is known as a blackhead
Sebaceous glands
Tiny muscles, attached to hair follicles, that pull the hair upright during fright or cold
Arrector pili
Perspiration glands with a role in temperature control
Sweat gland - Eccrine
Sheath formed of both epithelial and connective tissues
Hair follicle
Less numerous type of perspiration-producing gland; found mainly in the pubic and axillary regions
Sweat gland - Apocrine
Found everywhere on the body except the palms of hands and soles of feet
Sebaceous glands
Primarily dead/keratinized cells
Hair
Specialized nerve endings that respond to temperature, touch etc.
Cutaneous receptors
Secretes a lubricant for hair and skin
Sebaceous
"Sports" a lunule and a cuticle
Nail
Two integumentary system mechanisms that help in regulating body temperature
Sweating
Bloos vessels contrict/dilate to control heat
What organ system controls the activity of the eccrine sweat glands
Nervous system
3 common fingerprint patterns
Arches
Loops
Whorls