Integumentary System

Question 1

Describe two integumentary system mechanisms that help regulate body temperature.

Answer 1

eccrine sweat glands –> sweat evaporating absorbs heat fom body –> cools off body

Vasodilation –> blood vessels expand when body is too hot, inc. blood flow to skin’s surface
- allows more heat to dissipate into the surface
- vasoconstriction is opposite, blood flow is limited to maintain core temp. and reduce heat dissipation

Question 2

Pacinian corpuscle

Answer 2

deep touch receptor in reticular layer

Question 3

papillary layer of dermis

Answer 3

superior layer
made of areolar CT

Question 4

reticular layer of dermis

Answer 4

dense irregular CT

Question 5

Stratum corneum

Answer 5

All cells (keratinocytes) are dead
Waterproof, strong
superficial

Question 6

Stratum lucidum

Answer 6

Contains flattened, dead keratinocytes
In thick skin (palms of feet or hands)

Question 7

Stratum granulosum

Answer 7

lamellar granules and keratohyalin granules
1-5 layers of flattened cells
Starting to die
Waterproof and keratinization of cells

Question 8

Stratum spinosum

Answer 8

Tonofilaments (pre-keratin)
Living cells

Question 9

Stratum basale

Answer 9

Completely living Melanocytes and tactile epithelial (merkel cells)
Melanin (skin color)
Light touch receptors
Deepest stratum