Blood Vessels Structure

Question 1

What is the artery wall,structure

Answer 1

Thick and muscular

Question 2

What is the artery endothelium structure like

Answer 2

Present but folded

Question 3

What is the artery lumen structure like

Answer 3

Narrow

Question 4

What is the artery elastic content like

Answer 4

High

Question 5

Does the artery have valves

Answer 5

No

Question 6

What is the artery pressure like

Answer 6

High

Question 7

When does pressure in arteries drop

Answer 7

When ventricles relax,but stays quite high due to elastic recoil of walls

Question 8

In the artery what decreases with distance from the heart

Answer 8

Pressure,as there is resistance with blood flow due to friction with the larger surface area of walls and dissipation of energy in elastic recoil

Question 9

Why are artery Walls thick

Answer 9

To resist pressure

Question 10

In the artery what does the thick layer of elastic tissue stretch with

Answer 10

High pressure pulse then recoils maintaining pressure pushing blood out further and smooths out the flow

Question 11

In the artery what does narrow lumen maintain

Answer 11

Pressure

Question 12

In the artery what does thick muscle prevent

Answer 12

Rupture

Question 13

What is the Wall structure like in the vein wall

Answer 13

Thin

Question 14

What is the endothelium like in the vein

Answer 14

Present and not folded

Question 15

What is the lumen structure like in the vein

Answer 15

Wide

Question 16

What is the elastic content like in the vein

Answer 16

Low

Question 17

Are ther valves in the vein?

Answer 17

Yes

Question 18

In the vain what does a large volume result in

Answer 18

Low flow rate

Question 19

What is the pressure like in the vein

Answer 19

Pressure is always low,

Question 20

why do the vein walls not need thick muscle

Answer 20

Pressure is low

Question 21

What are the vein walls squeezed by and why

Answer 21

The skeletal muscle and breathing movements to push blood

Question 22

Why is the lumen wide

Answer 22

To fit large volume of blood and lower resistance

Question 23

What do valves in veins ensure

Answer 23

No backflow

Question 24

what is elastic recoil

Answer 24

the inherent resistance of a tissue to changes in shape, and the tendency of the tissue to revert to its original shape once deformed

Question 25

what do capillaries form as exchange surfaces

Answer 25

capillary beds which are many branched capillaries

Question 26

what is a capillaries diametre like

Answer 26

narrow to slow blood flow

Question 27

what about capillaries narrow diametre maximises diffusion

Answer 27

red blood cells can only just fit through and are squashed against the walls

Question 28

when comparing arterioles to arteries what is the muscle layer like when comparing the two

Answer 28

the arterioles muscle layer is thicker than arteries to help restrict blood flow inot the capillaries

Question 29

what is the elastic layer like in the arterioles compared to the arteries

Answer 29

thinner than in the arteries as pressure is lower

Question 30

what is wall thickness like in the arterioles compared to the arteries

Answer 30

thinner,as pressure is slightly lower

Question 31

do arterioles have valves

Answer 31

no

Question 32

do capillaries have a muscle layer

Answer 32

no

Question 33

what is the structure of the capillaries elastic layer like

Answer 33

doesnt have one

Question 34

what is the capillaries wall thickness like

Answer 34

one cell thick, consisting of only a lining layer

Question 35

why is the capillary wall thickness advantageous

Answer 35

this provides a short diffusion distance for exchanging materials between the blood and cells

Question 36

from right to left what makes up a capillary bed

Answer 36

artery,arterioles,capillaries,venules,vein