Lecture 6 Block 2 Flashcards
(23 cards)
what are alpha delta fibers for
cold receptors
what are C fibers for
warm recepotrs
what are the 3 layers of the skin
epidermis, dermis, hypodermis
what epithelium are in the epidermis
keratinized and non-keratinized stratified squamous epithelium
what is the function of stratified squamous epithelial tissue
retain water, barrier
what epithelium is the dermis made of
areolar and dense irregular connective tissue
what is the function of areolar tissue
water reservoir, presence of blood vessels
what is the function of dense irregular connective tissue
presence of blood vessels
name other “things” in the dermis
adipose tissue, hair follicle, arrector pili muscle, sweat glands, sebaceous glands, blood vessels, thermoreceptors
what is the function of hair follicles
insulation
what is the function of the arrector pili muscle
alter boundary layer thickness
what are the two types of sweat glands
eccrine gland and apocrine galnd
describe the eccrine gland
sweat exits at pore
describe the apocrine gland
effective sweat gland, not for cooling
describe the sebaceous gland
sebum exits near hair
what type of epithelium exists in the hypodermis
adipose connective tissue
what is the function of adipose connective tissue
insulation, generation of heat
what are the two types of temperature gated ion channels
TRPV1 and TREK-2
what are TRPV1 receptors
transient receptor potential changes, sense temperature variation, cause neuronal excitation through Na+ and Ca2+ influc
what are TREK-2 receptors
“leak” channels, mediate temperature controlled efflux of K+ contribute to electric potential on the PM at rest counterbalance excitatory action of the TRPs during temperature driven excitation
when does vasodilation occur
when an organism needs to lose heat
what does TRPV1 respond to
less than 43 degrees celsius
what does TRPV2 respond to
less than 52 degrees celsius
