Topic 3 - Blood Vessels [6]

Question 1

Veins thin, what this mean

Answer 1

veins cant control blood flow

Question 2

Arteries have thicker walls than veins… Why?

Answer 2

Prevent walls bursting from the high pressure required in arteries.

Question 3

Arteries have a thicker Elastic Layer than Veins… Why?

Answer 3

So it can maintain blood pressure. Elasticity allow it to stretch and recoil in response to heart beat.

Question 4

Arteries have a thicker Muscle Layer than Veins… Why?

Answer 4

so it can constrict and dilate for controlling blood volume

Question 5

Capillaries wall thickness?

Answer 5

One cell thick, providing a short diffusion distance for exchanging material between the blood and the cells.

Question 6

Capillaries elastic layer?

Answer 6

No elastic layer

Question 7

what is capillaries muscle layer thickness?

Answer 7

no muscle layer

Question 8

Arteries
Arterioles
Veins
Capillaries
Which ones have valves

Answer 8

Arteries

Veins

Question 9

Veins have a thin everything… why?

Answer 9

Wall thin because Pressure is lower so low risk of bursting
E layer thin because pressure is lower
muscle layer is thin because no reason given, cannot control blood flow

Question 10

Arterioles have a THINNER Elastic layer and wall thickness than Arteries… Why?

Answer 10

Pressure is lower in arterioles.

Question 11

Arterioles have THICKER muscle layer than Arteries… Why?

Answer 11

To restrict blood flow into capillaries

Question 12

Capillary beds have a narrow diameter, why?

Answer 12

slow blood flow. red blood cells can just barely fit in and this maximises diffusion.

Question 13

capillaries form _________ ____ as exchange surfaces.

Answer 13

Capillary Beds

Question 14

State order of vessels for transporting blood away from the heart

Answer 14

Arteries carry blood away from heart into arterioles.
Arterioles - connect to;
Capillaries - connect arterioles to veins
Veins carry blood back in heart