Vessels

Question 1

3 Types of Vessels?

Answer 1

Arterial System – blood away from heart
Venous System – blood toward heart
Lymphatic Vessels – lymphs towards heart

Question 2

What are the 4 types of microcirculation?

Answer 2

typical capillary bed
arteriovenous anastomosis (AV shunt)
arterial portal system (2 capillary networks - kidney)
venous portal system (2 capillary network - liver)

Question 3

artery vs vein?

Answer 3

artery = thick wall and lumen (circular)
vein = thick wall and lumen (irregular)

Question 4

Endothelial cells of vessels and their function?

Answer 4

specialized simple squamous epithelium
modified junctional complexes
- selective permeable barrier
- modulate blood flow
- anti-thrombogenic (prevent blood clot)

Question 5

Muscular Artery Tunics?

Answer 5

Tunica Intima
- endothelium, basement membrane, INTERNAL ELASTIC LAMINA
Tunica Media
- smooth muscle, external elastic lamina
Tunic Adventitia
- loose CT, nervi vasorum, vasa vasorum

Question 6

Elastic Arteries

Answer 6

Tunica Intima
- endothelium, basement membrane, subendothelial CT with smooth muscle, internal elastic lamina
Tunica Media (THICK)
- smooth muscle, ELASTIC FIBER, external elastic lamina
Tunic Adventitia
- loose CT, macrophage, fibroblast, nervi vasorum, vasa vasorum

Question 7

Small Artery vs Arteriole

Answer 7

artery - internal elastic lamina with 4 layers smooth
arteriole - 1 layer smooth muscle

Question 8

Capillary structure, function, type?

Answer 8

• single layer of endothelial cell with basement membrane (no tunica media/adventitia)
• 1 RBC in lumen
• fenestrated (pores) vs discontinuous (incomplete)

Question 9

Venule

Answer 9

• single layer of endothelial cell with basement membrane (no tunica media/adventitia)
  Post capillary venule = more than 1 RBC in lumen
  Collecting venule = smooth muscle coat

Question 10

Veins

Answer 10

Tunica Intima
- endothelium, basement membrane, subendothelial CT with smooth muscle, internal elastic lamina
Tunica Media
- smooth muscle
Tunic Adventitia (THICK)
- loose CT, nervi vasorum, vasa vasorum, SMOOTH MUSCLE

Question 11

Vena Cavae

Answer 11

Tunica Intima
- endothelium, basement membrane, subendothelial CT with smooth muscle
Tunica Media
- smooth muscle
Tunic Adventitia (THICK)
- loose CT, nervi vasorum, vasa vasorum, longitudinal bundles SMOOTH MUSCLE

Question 12

Lymph vessels flow and properties?

Answer 12

unidirectional and passive
- anchoring filaments – keep lumen open
- valves
- thin endothelial wall with amorphous irregular lumen