MOD 3: BLOOD VESSELS

Question 1

Blood Vessel Walls

Answer 1

3 Layers:
>Tunica Adventitia (Outer)
>Tunica Media (Middle)
>Tunica Intima (Inner)

*Capillaries only consist of a single layer

Question 2

Blood Vessel Structure

Answer 2

Four Constant Structures
>Lining Endothelial Cells
>Collagen Fibres
>Elastic Fibres
>Smooth Muscle Fibres

Question 3

Lining Endothelial Cells

Answer 3

> Line entire vessel
Inhibits intravascular coagulation (clotting)
Contains pores for diffusion
Can reproduce

Question 4

Collagen Fibres

Answer 4

> Reinforce woven strands
Minimal stretch (2%-3%)
Strengthen walls

Question 5

Elastic Fibres

Answer 5

> Made of elastin
Capable of stretching beyond 100%
Allows recoil post-distension
Maintains passive tension to maintain BP

Question 6

Smooth Muscle Fibres

Answer 6

> Not found in capillaries
Most common of elastic and muscular arteries
Exhort active tension when contracting

Question 7

Tunica Adventitia

Answer 7

> Outermost layer
Strong & flexible connective tissue
Helps hold vessel open
Prevents tearing of vessel during movement
Largest layer in veins
Second largest layer in arteries

Question 8

Tunica Media

Answer 8

> Middle layer
Smooth muscle tissue
Sandwiched between elastic connective tissue
Muscle allows for changes in diameter
Innervated by the ANS
Largest layer in arteries
Second largest layer in veins

Question 9

Tunica Intima

Answer 9

> Innermost layer
Extremely thin endothelial cells
Only layer present in capillaries
Contain semilunar valves in veins

Question 10

Arteries

Answer 10

> Carry oxygenated blood away from the heart (san pulmonary artery)

Three kinds
>Elastic Arteries
>Muscular Arteries
>Arterioles

Question 11

Veins

Answer 11

> Carry deoxygenated blood to the heart