HE 22 Preview

Question 1

Three Layers of Blood Vessel and significance

Answer 1

Tunica Intima
Tunica Media
Tunica Adventitia (externa)

presence, thickness and composition of these three layers define blood vessels

Question 2

Tunica Intima

Answer 2

1. endothelium
   - simple squamous lining lumen
   - connecte dby jxnl complexes
   - BL
2. subendothelial CT layer
   - loose CT
   - scattered SM and Macrophages
   - separated from TM by IEL (internal elastic lamina)

quite compressed, hard to see, identifiable by IEL (orcein)

Question 3

Tunica Media

Answer 3

SMC!!!

• communicate via GJ
• seme are contractile: corkscrew nuclei
• some are secretory: synthesize elastic lamina
• before TA have EEL (external elastic lamina), hard to see, small layer less visible folds

Question 4

Tunica Adventitia

Answer 4

• Fibrolelastic CT
• VASO VASORUM: lumen only supplies TI and 1/2 TM with nutrieunts, the rest is supplied by VV
• ANS post ganglionic nerves release NT’s which diffuse to SMC for excitation spread via GJ’s