25 terms

Mammalogy Lab #2c: Integument, Hair, & Glands

coat of hair that functions primarily as insulation, but different patterns of hair coloration can serve in communication or camouflage
modified hairs sometimes called whiskers that serve as tactile receptors
sebaceous gland
secretes oil to keep hair supple and somewhat waterproof, each hair follicle has its own
arrector pilli
muscle associated with each individual hair; allows the mammal to raise its hairs for insulation or as a threat
a thickening of the epidermis that pushes into the dermis to create a follicle that has a root that nourished by blood vessels allowing the hair to grow
hair that is evergrowing
hair that reaches a certain length and stop growing
guard hairs
serve mainly as protection, and may be highly modified for this purpose
large, stiff, guard hairs with definitive growth used mainly in predator defense
found on many spines and allow the spine to lodge in the predator's skin and make it very difficult to remove
function primarily for insulation
when hair is shed and replaced periodically
annual molt
once a year, hairs are replaced in a short period of time
seasonal molt
occurs more than one time a year
pigment that produces blacks and browns in hair
pigment that produces reds and yellows in hair
white hair
results from complete lack of pigment
agouti hair
black tip followed by bands of phiomelanin and eumelanin
cryptic coloration
allows mammals to blend with their environment
disruptive coloration
obscures body contures and allow animal to mimic patterns of shade and light (often in the form of strips and spots)
ventral surface is lighter in color than dorsal surface that serves to blur the animal's outline when seen from above
aposematic coloration
serves to warn that they are dangerous or distasteful
sweat glands
function to promote cooling and rid body of some waste products
scent glands
used for attracting mates, marking territories, communication during social interactions, or protection
mammary glands
highly modified sweat glands that secrete milk for nursing young