Biology B3 Blood vessels

Question 1

what is the description for a diagram of an artery ?

Answer 1

Diameter of lumen should be drawn smaller than the vein.
Walls should be thicker than the vein.

Question 2

what is the description for a diagram of an vein ?

Answer 2

It should be drawn with the widest diameter of lumen.
Wall should consist of a single layer of epithelial cells.

Question 3

what is the description for a diagram of a capillaries ?

Answer 3

It should be drawn with the narrowest diameter of lumen. Walls should consist of a single layer of epithelial cells.

Question 4

what is the direction of arteries ?

Answer 4

Arteries are away from the heart

Question 5

what is the direction of veins ?

Answer 5

veins are towards the heart

Question 6

what is the direction of capillaries ?

Answer 6

Capillaries are a link between arterioles and venules.

Question 7

what pressure do arteries have ?

Answer 7

High pressure.

Question 8

what pressure do veins have ?

Answer 8

low pressure

Question 9

what pressure do capillaries have ?

Answer 9

Low pressure

Question 10

what is the diameter of the lumen in arteries ?

Answer 10

Narrow , It also varies between pumping cycles

Question 11

what is the diameter of lumen in veins ?

Answer 11

wide

Question 12

what is the diameter of lumen in capillaries ?

Answer 12

Very narrow

Question 13

what is the wall thickness of arteries ?

Answer 13

Thick

Question 14

what is the wall thickness of veins ?

Answer 14

Thin

Question 15

what is the wall thickness of capillaries ?

Answer 15

Very thin permeable walls. One cell thick

Question 16

do arteries have vales ?

Answer 16

no

Question 17

do veins have valves ?

Answer 17

Yes , to prevent the backflow of blood

Question 18

do capillaries have valves ?

Answer 18

No

Question 19

Describe how the structure fits the function of arteries ?

Answer 19

Arteries carry blood away from the hear at a high pressure . To maintain high pressures between pumping cycles , the walls or arteries are thick and contain elastic fibres.

Question 20

Describe how structure fits function of capillaries ?

Answer 20

Capillaries are the site of exchange of materials between the body’s tissues and bloodstream.

Capillaries have very thin permeable walls consisting of a single layer of cells reduces the distance for diffusion to occur and increases the efficiency of gas exchange.

Capillaries have a narrow lumen allowing capillaries to fit into small spaces through the body’s tissues.

Question 21

Describe how the structure fits the function of veins?

Answer 21

Veins carry blood towards the heart at low pressure therefore thick muscular walls are not needed .

Veins have valves to prevent backflow of blood . A wider lumen reduces resistance of blood flow.