Histo 4: Vessels

Question 1

What are the three layers of a vessel (from inside to outside)?

Answer 1

1. Tunica Intima
2. Tunica Media
3. Tunica Adventitia OR Tunica Serosa

Question 2

Are endothelial cells in every vessel?

Answer 2

yes

Question 3

endothelial morphology

Answer 3

simple squamous

Question 4

angiogenesis

Answer 4

growth of new blood vessels

Question 5

Various Functions of Endothelial Cells

Answer 5

Barrier
Production of the Basement Membrane
Vasoactive Factors
Angiogenesis

Question 6

What is the only layer of a vessel in a capillary?

Answer 6

tunica intima

Question 7

How are endotheliel cells joined in capillaries?

Answer 7

tight junctions

Question 8

3 Types of Capillary Endothelium

Answer 8

1. Continuous
2. Fenestrated
3. Sinusoidal

Question 9

hemangiopericytomas

Answer 9

tumors of the pericytes surrounding capillaries

Question 10

Most prevalent capillary type?

Answer 10

continuous

Question 11

Where do you find fenestrated capillaries?

Answer 11

tissues with substantial fluid transport (GI tract, kidney, endocrine organs)

Question 12

In what organ is the diaphragm (thin membrane) of the fenestrated capillary not found?

Answer 12

kidney

Question 13

In what type of capillary do you most commonly find vesicles?

Answer 13

continuous

Question 14

Unique Features of SInusoidal Capillaries

Answer 14

open up into a non-vascular space
larger than most capillaries
lacks uniformity in diameter (slows blood flow)

Question 15

Where do you find sinusoidal capillaries?

Answer 15

liver, bone marrow, spleen, nasal cavity, some endocrine

Question 16

Which has an internal elastic lamina - arteries or veins?

Answer 16

arteries

Question 17

Best way to distinguish arteriole vs. venule?

Answer 17

amount of smooth muscle in the tunica media

Question 18

Which sometimes has valve - veins or arteries?

Answer 18

veins

Question 19

Which sometimes looks misshapen - veins or arteries?

Answer 19

veins

Question 20

In what tissue do you find high endothelial vessels (HEV)?

Answer 20

lymphoid

Question 21

What is unique about the endothelium of HEVs?

Answer 21

simpple cuboidal, with an incomplete basement membrane and very thin connective tissue

Question 22

Where would you never find fenestrated capillaries?

Answer 22

anywhere there’s a barrie, ex: blood-brain

Question 23

Biggest difference between veins and lymphatics?

Answer 23

you will not see any erythrocytes in lymphatic tissue

Question 24

Label vein, artery, capillary, lymphatic.

Answer 24

Vein = 5
Artery = 1, 3
Lymphatic = 2
Capillary = 4

Question 25

What vessels lack a tunica muscularis?

Answer 25

capillaries, lymphatics

Question 26

Answer 26

A = endothelial cell
B = pericyte

Question 27

Lymph lacteal

Answer 27

drains fats in addition to lymph in the GI tract

Question 28

A wavy tunica intima is a good indicator that it is what vessel?

Answer 28

artery/arteriole