8.2 Blood Vessels

Question 1

Elastic fibres

Answer 1

Composed of elastin. Can stretch and recoil. Provides flexibility in vessel walls

Question 2

Smooth muscle

Answer 2

Contracts of relaxes changing lumen size

Question 3

Collagen

Answer 3

Provides structural support to maintain shape and volume of vessel

Question 4

Artery

Answer 4

Carries oxygenated blood to tissues except pulmonary artery which carries deoxygenated blood to lungs from heart

Question 5

Artery wall

Answer 5

Contains elastic fibres, smooth muscle and collagen.

Question 6

Arteriole

Answer 6

Links arteries with capillaries. Have more smooth muscle and less elastin as they have little pulse.

Question 7

Vasoconstriction

Answer 7

Smooth muscle in artetiole contracts preventing blood flowing into capillary bed.

Question 8

Vasodilation

Answer 8

Smooth muscle in arteriole relaxes, blood flows through capillary bed

Question 9

Capillary

Answer 9

Microscopic blood vessel linking arterioles to venules. Forms extensive network. Narrow lumen, erythrocytes have to travel single file.

Question 10

Vein

Answer 10

Medium sized vessel. Majority of venous system. Wide lumen. Smooth thin lining (endothelium).

Question 11

Venule

Answer 11

Links capillary to vein. Thin walls with little smooth muscle.

Question 12

One-way valve

Answer 12

Prevents blood from flowing in the wrong direction. Closes when backflow occurs.