Tissues, organs and systems

Question 1

What are the 5 GI tract layers in order?

Answer 1

Mucosa, Muscularis mucosa, Submucosa, Muscularis external, Serosa

Question 2

3 functions of mucosal membranes

Answer 2

• Prevent entry of pathogens
• Prevent dehydration of tissues
• Lubrication

Question 3

Function of mucous membranes in GI tract (3 things)

Answer 3

• Move contents and expel waste
• Prevent ingress of pathogens
• Absorb substances from lumen

Question 4

Function of mucous membranes in urinary tract (3 things)

Answer 4

• Remove waste
• Absorb nutrients
• Prevent pathogen entry (especially in lower UT)

Question 5

Mucosal membranes

Answer 5

Moist inner lining of some organs and body cavities

Question 6

5 Basal junctions in epithelia

Answer 6

• Hemi-desmosomes
• Focal junctions
• Integrins
• Proteoglycans
• Cell adhesion molecules

Question 7

4 Lateral junctions in epithelia

Answer 7

• Desmosomes
• Gap-to-gap junctions
• Tight junctions
• Adherens junctions

Question 8

Mucociliary escalator

Answer 8

Mucus traps dirt/pathogens and cilia waft it towards back of throat to be swallowed

Question 9

What do mucous membranes consist of (4 things)?

Answer 9

• Epithelium lining lumen of tube
• Adjacent layer of CT (lamina propria)
• Layer of smooth muscle (muscularis mucosae)
• Vascular