Tri B - The Circulatory System

Question 1

Describe the shared structure of Arteries, arterioles, veins and venules

Answer 1

Lumen
3 layers : Tunica interna
Tunica Media
Tunica Externa

Question 2

Describe the tissues of the blood vessels

Answer 2

Tunica Interna - Squamous epithelium, internal elastic lamina
Tunica Media - smooth muscle, external elastic lamina
Tunica Externa - Fibrous tissue

Question 3

Describe Arteries (Elastic)

Answer 3

Largest vessel
Conducting
Tunica Media - more elastic, less muscle

Question 4

Describe Arteries (Muscular)

Answer 4

Medium
Distributing
Tunica media - less elastic, more muscle

Question 5

Describe Arterioles

Answer 5

Small arteries
Deliver blood to capillaries
Mostly smooth muscle

Question 6

Describe capillaries

Answer 6

Microscopic vessels - single celled wall
Provide connection between arteries and veins
Allow exchange of nutrients

Question 7

Describe venules

Answer 7

Small veins
Connected to capillaries
Drain blood to veins

Question 8

Describe veins

Answer 8

Carry blood to heart
Same layers but thinner, externa thickest
Larger lumen, can appear flattened
Veins contain valves, cusps face heart

Question 9

Describe pulmonary and systemic circulation

Answer 9

Pulmonary - between heart and lungs
Systemic - between heart and body

Question 10

Describe coronary circulation

Answer 10

Heart receives blood from right and left coronary arteries
Coronary arteries branch off ascending aorta

Question 11

Describe anastomoses

Answer 11

Union of 2 or more adjacent arteries supplying same body region
End arteries - circle of willis