chapter 9 Flashcards
tissue types
what is the epithelium?
epithelial tissue
what two types does the epithelial tissue divide into?
- membraneous
- glandular
what’s the function of membraneous epithelium tissue?
it covers the body and lines the serious cavities(pleura, peritoneum),
blood and lymphatic vessels
respiratory and digestive tracts
what’s the function of the glandular epithelium tissue?
form secretory units of endocrine and exocrine glands
what’s are the 5 functions of epithelium?
- protection(most important)
- sensory functions
- secretion
- absorption
- execretion
since epithelium has limited amount of matrix(fluid around cells) what do the spaces in between have?
interstitial fluid
does epithelium renew itself and continuously produce new cells of different types?
yes
what are the four cell shapes of the membraneous epithelium?
squamous, cuboidal, columnar, and psuedostratified columnar
what does the squamous shape look like?
flat like a plate
what does the cuboidal shape look like?
cube-shaped and has more cytoplasm than squamous
what’s the columnar shape look like?
narrow and cylindrical
what does the psuedostratified columnar shape look like?
1 layer of oddly shaped cells
what is simple epithelium?
one layer
what is stratified spithelium?
layered with multiple
what is endothelium?
blood and lymphatic blood vessel lining
can glandular epithelium function as unicellular or multicellular?
both
what are exocrine glands?
they discharge secretion products into ducts
what’s an example of an exocrine gland?
salivary glands
what are endocrine glands?
discharge secretion(hormones) directly into blood or interstitial fluid
what’s an example of endocrine glands?
pituitary thyroid
what two shapes do exocrine glands have?
- tubular
- alveolar
how many ducts does a simple gland have?
one
how many ducts does a compound gland have?
two of more
what are the different methods that exocrine glands discharge secretion? (3)
- apocrine
- holocrine
- merocrine
what is the apocrine glands discharge method?
apocrine glands collect secretions from the tip face of the cell and release them into a duct by pinching a vesicle. They lose cytoplasm and have damage
example of apocrine glands method:
mammary glands that produce milk
what’s the holocrine discharge method?
holocrine glands collect secretions inside the cell and rupture completely and release it ( self-destruct)
example of holocrine gland method?
sebaceous gland producing oil to lubricate skin
what is the merocrine gland method?
merocrine glands discharge secretions through the cell or plasma membrane. there is no injury and no loss of cytoplasm
example of merocrine glands method:
salivary glands
which of the four main tissues is the most widespread and exists in many varied forms?
connective tissues
what are the functions of connective tissue? (6)
- connects tissues together
- connects muscle to muscle
- muscle to bone
- bone to bone
- supporting framework for body
- defends against invaders
what are the major types of connective tissue? (4)
- fibrous
- bone
- cartilage
- blood