Blood vessels

Question 1

What are the three layers in blood vessels?

Answer 1

Tunica intima (inner)
Tunica media
Tunica externa (outer)

Question 2

What is the most innermost layer of BV?
What is it made of?
Function?
Anything else?

Answer 2

Tunica Intima- innermost
Endothelial cells create slick surface for smooth blood flow
Receives nutrients from blood in lumen
One cell thick
Large vessels may have subendothelial layer basement membrane- supports endothelial cells

Question 3

What is the middle layer in blood vessels?
Made of?
Function?

Answer 3

Tunica Media- middle layer (M)
Made smooth muscle cells, elastin protein sheets
Receives nutrients from lumen

Question 4

What is outermost layer of BV?
Made of?
Function?

Answer 4

Tunica Externa- outermost
Made woven fibres of collagen, elastic
Protects and reinforces blood vessel; helps anchor

Question 5

What supplies blood to vessels?

Answer 5

Vaso vasorum

Question 6

Which vessels have the most increase in pressure?

Answer 6

Arteriole

Question 7

Is elastic tissues present in arteries or arterioles?

Answer 7

Arteries

Question 8

Which vessel has the thinnest wall?

Answer 8

Capillary

Question 8

Which vessel has the thinnest wall?

Answer 8

Capillary

Question 9

Which vessels have fibrous muscle present?

Answer 9

Artery, venule, vein

Question 10

What starling forces drive fluid out of vessels?

Answer 10

Capillary hydrostatic pressure
Osmotic force- due IF protein conc.

Question 11

What starling forces drive fluid in to vessels?

Answer 11

IF hydrostatic pressure
Osmotic force- due plasma protein concentration

Question 12

Label artery?

Answer 12

Question 13

Label vein?

Answer 13

Question 14

Function of:
Arteries
Capillaries
Veins

Answer 14

Arteries- carry blood away heart high pressure
Veins- return blood to heart low pressure
Capillaries- supply cell with requirements
- take away waste products

Question 15

Structure wall of:
Arteries
Veins
Capillaries

Answer 15

Arteries- thick, strong
- muscles, elastic fibres, fibrous
tissue
Veins- thin
- main fibrous, little muscle and elastic
Capillaries- very thin
- one cell thick

Question 16

What has more muscle and elastic- veins or arteries?

Answer 16

Arteries

Question 17

Size of lumen of:
Arteries
Veins
Capillaries

Answer 17

Arteries- narrow
Veins- wide
Capillaries- v narrow- just RBC

Question 18

What vessel has valves?

Answer 18

Veins- prevent backflow

Arteries and capillaries don’t

Question 19

Function of arteries and how structure fits?

Answer 19

Strength/elasticity- withstand pulsing blood
- prevent bursting
- maintain pressure wave
- maintain high BP- no bf

Question 20

Function veins and how structure fits?

Answer 20

No strong walls- most pressure lost
Wide lumen- less resistance to blood flow

Question 21

Function capillaries and how structure fits?

Answer 21

No strong walls- most bp been lost
Thin walls/narrow lumen- blood close contact
body tissue
Allow diffusion
WBC pass between wall cells

Question 22

What are 3 different artery types?

Answer 22

Elastic
Muscular
Arterioles

Question 23

Elastic arteries?

Answer 23

Lot elastin in tunic media/externa
Allow arteries expand/recoil
Absorb pressure
Largest
Closest heart

Question 24

Muscular arteries?

Answer 24

Distributing arteries
Carry blood to organs and tissues
Thick muscular walls

Question 25

Arterioles?

Answer 25

Thick tunica media
Smallest arteries
Site most resistance
Regulate blood flow to organs
Dilate/constrict response hormones/ANS
Allow thermogenesis

Question 26

What is the site of most resistance?

Answer 26

Arterioles

Question 27

Label?

Answer 27

Question 28

A,V,C

Answer 28