CTL week 3

Question 1

what is the purpose of adherens junctions?

Answer 1

what is the purpose of adherens junctions?

Answer: resist separation during contractile activities
exp: moving food through the intestines

Question 2

what is the purpose of desmosomes junctions?

Answer 2

what is the purpose of desmosomes junctions?

Answer:
prevent separation when under tension.
exp: cardiac muscle cell during contraction

Question 3

hemidesmosomes use what transmembrane glycoprotein to bind to which protein of the basement membrane?

Answer 3

hemidesmosomes use what transmembrane glycoprotein to bind to which protein of the basement membrane?

Answer:
integrins from cell bind to laminin present in basement membrane.

Question 4

what are the membrane proteins used in gap junctions?

Answer 4

what are the membrane proteins used in gap junctions?

Answer: connexins (protein) form Connexons (tunnel)

Question 5

gap junctions allow for transfer of nutrients, waste, and small molecules between cells found where?

Answer 5

gap junctions allow for transfer of nutrients, waste, and small molecules between cells found where?

Answer: cornea of the eye

Question 6

3 major differences between connective an epithelial tissue?

Answer 6

3 major differences between connective an epithelial tissue?

Answer:
1- Epithelial tissue has little/no extracellular matrix but connective tissue has a lot of ECM

2- Epithelial tissue has no blood vessel but connective does.

3- Epithelial always form surface layers but connective does not.

Question 7

is epithelial tissue depending on immediately adjacent blood vessel-rich connective tissue?

Answer 7

is epithelial tissue depending on immediately adjacent blood vessel-rich connective tissue?

Answer: yes, because epithelial tissue has no blood vessel.

Question 8

general Epithelial architecture is?

hint: GASAPP

Answer 8

general Epithelial architecture is?
(hint: GASAPP)

Answer:

• Gland
• Avascular
• Support
• Adhesion
• Proliferation
• Polarity (apical basement polarity)

Question 9

functions of Epithelial cells?

hint: ps.seats

Answer 9

functions of Epithelial cells?

Answer: ps. seats.

• Protection
• Selective permeability
• Secretion
• Excretion
• Absorption
• Transport
• Sensory perception

Question 10

what are the 2 layers of the basement membrane?

Answer 10

what are the 2 layers of the basement membrane?

Answer:
- Basal lamina (from epithelial), has laminin, collagen, glycoproteins, and proteoglycans,

• Reticular lamina (from connective), has fibroblast