Tissues of the Body 2.1

Question 1

State functions of epithelia

Answer 1

Protective barrier

Regulation of exchange of molecules between compartments (selective diffusion + absorption)

Synthesis + secretion of glandular products

Question 2

State examples of surface epithelia

Answer 2

Exterior surfaces:

Skin, surface of cornea

Interior spaces opening to exterior:

GI tract
Respiratory tract
genitourinary tract

Interior spaces not open to exterior

Pericardial sac
Leural sacs
Peritoneum
Blood + lymphatic vessels

Question 3

Basement membrane understanding

Answer 3

Question 4

State the function of the basement membrane

Answer 4

Seperates epithelial cells from subtending connective tissue

Question 5

Describe the structure of the basement membrane

Answer 5

1. Basal lamina (Type IV collagen) laid down by epithelial cells

Question 6

State the role of microvilli

Answer 6

Increase cellular SA
For selective reabsorption of intestinall contents
Supported by actin filamentds

Question 7

State which epithelium is present in villus of small intestine

Answer 7

Simple columnar epithelium

Question 8

Which vessel in villi is required to absorb fat?

Answer 8

Lacteals (in lamina propria)

Lacteals adapted to have smooth muscle for absorption

Question 9

Give an example how simple columnar epithelium can be specialised

Answer 9

Cilliated

Question 10

State role of motile cillia

Answer 10

Move substances e.g. mucus

Question 11

State role of non motile cilia

Answer 11

Sensory role

Question 12

State the causes of kartagener syndrome

Answer 12

aka primray ciliary dyskinesia

Causes infertility in males:

disfunction of cillia in reproductive system
- sperm motility
- transport of sperm cells, cillia help move sperm through vas deferens, this doesnt happen, affect fertilisation

Question 13

State where ciliated simple columnar epithelium is found

Answer 13

Oviduct
Propel oca towards uterus

Question 14

State functions of simple columnar epithelium

Answer 14

TALLS - acronym

Transport - OVIDUCT
Absorption - small intestine, colon, gall bladder
Lubrication - small intestine, colon
Linng of larger endocrien glands
Secretion - small intestine, colon, stomach lining, gastric glands

Question 15

State where pseudostratified coulumnar epithelium is found

Answer 15

Upper (conducting) respiratory tract.

Nuclei at different levels characterises pseudostratified simple columnar - histology