Epithelial Tissues I

Question 1

epithelia are

Answer 1

the tissues that line body surfaces, body cavities and the surface of interanal tubes, ducts and other spaces in organs

Question 2

epithelial cells are adherent to

Answer 2

one another

Question 3

epithelial cells are arranged in

Answer 3

sheets or layers

Question 4

most epithelial are _______: they have

Answer 4

• polarized

- apical or basolateral surfaces

Question 5

basal lamina

Answer 5

lines and is attached to the basal surfaces and also attached to elements of the underlying connective tissue

Question 6

epithelial tissues undergo

Answer 6

turn-over or renewal: cells die and must be replaced by cell division and differentiation (driven by epithelial stem cells)

Question 7

epithelial cells are ______: nutrients and oxygen must _______ to reach epithelial cells

Answer 7

• avascular

- diffuse through connective tissue and through basal lamina

Question 8

Functions of the epithelia

Answer 8

• barrier
• selective absorption and transport
• selective secretion
• movement through passage ways
• biochemical modification of molecules
• communication
• reception of stimuli

Question 9

tissue that faces blood and lymph

Answer 9

endothelium

Question 10

cells that line the enclosed internal spaces of the body cavities

Answer 10

mesothelium

Question 11

moist linings of the internal passageways are called

Answer 11

mucosa

Question 12

the surface layer of mucosae

Answer 12

epithelium

Question 13

epithelia are derived from _____ in developemnt

Answer 13

all three germ layers

Question 14

embryonic epithelia often disassemble and move into the _______; there they may migrate to other locations to _______ or may

Answer 14

• mesenchymal tissues
• form new epithelia
• transform into distinct non-epithelial cell lineages that give rise to other tissues

Question 15

the basal side is attached to the _______ which in turn is attached to the underlying _______

Answer 15

• basal lamina

- connective tissue

Question 16

______, ______ and _______ run through the CT

Answer 16

lymph vessels, blood vessels and many nerves

Question 17

because epithelia are avascular, they much get O2 and nutrients from and communicate with _______

Answer 17

blood vessels that course through the CT

Question 18

muscles are embedded within

Answer 18

connective tissue layers that are also typically deeper relative to the epithelial surface (although some small muscle tissue can be very close to the epithelial surface)

Question 19

muscle, blood vessels and nerves typically are surrounded by _______ that attach to _______

Answer 19

• their own basal laminae

- their own neighboring connective tissues