epithelial tissues/ CT/ GI tract lining

Question 1

what are the functions of epithelial tissues?

Answer 1

absorption and secretion (active)
diffusion and filtration (passive)
propulsion (cillia) 
sliding (?)
protection
sensory reception.

Question 2

what are the types, function and locations of simple epithelium?

Answer 2

1. simple squamous (thinnest kind) for diffusion
   located in the alveoli, endothelium (inner lining of heart and blood vessles), glomerular capsule in the kidney (where filtration occurs), lining of closed body cavities.
2. Simple cuboidal, for secretion. glands: salivary glands, pancreas, lining of ovary, kidney tubules.
3. Simple columnar, noncilliated lines most of digestive tract.
   cilliated lines small bronchi-sweeps away debris.

Question 3

what is the definition of epithelium?

Answer 3

tissues that
-covers or lines surfaces and cavities of the body
or
-forms glands

Question 4

what are the types, function and location of the dense ct.

Answer 4

dense irregular CT-
+ collegen fibers running in both directions. located in the dermis, synovial joints and organ capsules. resists tension.
elastic CT- +elastic fibers, allows recoil, in broncial tubes, artery walls, intervertibral ligaments.
dense regular-
collegen and tension resistance run in one direction. tendons and ligaments, fascia.

Question 5

what are the types, function and location of loose connective tissue?

Answer 5

areolar- most widespread and ‘generic’
adjoins all epithelia, is a gel like matrix that contains fat cells and defense cells.
adipose- almost all fat cells. located in the hyoermis also the visceral fat around organs. for nrg storage, protection and insulation.
reticular- almost all reticular fibers in matrix, exclusively in the lymphoid organs.

Question 6

cupids arrow through the gi tract lining

Answer 6

parietal peritonium, peritonial cavity, viserral peritonium, mucosa, lumen.