Chapter 21 - Blood Vessels

Front 1

What carries blood away from the heart to a tissue?

Back 1

Arteries

Front 2

What are Arterioles?

Back 2

small arteries that connect to capillaries

Front 3

what are capillaries roll?

Back 3

exchange substance between the blood and body tissue

Front 4

venules

Back 4

connect capillaries to large veins

Front 5

veins..

Back 5

convey blood from the tissues back to the heart

Front 6

Angiogenesis is

Back 6

the growth of new blood vessels

Front 7

Endothelium

Back 7

a single squamous epithelium that forms the inner layer of the tunica interna (intima)

Front 8

tunica interna (intima)

Back 8

is the inner lining of the blood vessel. a combination of the endothelium, the basement membrane, and the internal elastic lamina.

Front 9

tunica interna (intima)

Back 9

is the inner lining of the blood vessel. a combination of the endothelium, the basement membrane, and the internal elastic lamina.

Front 10

Basement membrane

Back 10

contains protein that give it strength and provides flexibility for stretching and coiling. It provides a physical support base for the epithelial layer.

Front 11

Internal Elastic Lamina

Back 11

thin sheet of elastic fibres with openings that help with diffusion of material through tunica interna to thicker tunica media

Front 12

Tunica Media

Back 12

middle layer that regulates the diameter (opening) and pressure of the blood vessels. this middle layer is made and filled of smooth muscle.

Front 13

Tunica Externa (adventia)

Back 13

it anchors the vessels to surrounding tissue. It contains its own little blood vessels (vaso vasorum) and openings for nerve endings (nervi vasorum)

Front 14

Capillaries

Back 14

are microscopic vessels that usually connect arterioles and venules.

Front 15

"microcirculation"

Back 15

the flow of blood through the capillaries

Front 16

Primary function of capillaries

Back 16

is to permit the exchange of nutrients and wastes between the blood and tissue cells through interstitial fluid.

Front 17

capillaries walls

Back 17

are composed of a single layer cell and a basement membrane. thus the reason for exchange through walls.

Front 18

Metaarterioles

Back 18

are a transitional vessel between the arterioles and the capillaries.

Front 19

Metaarterioles

Back 19

are a transitional vessel between the arterioles and the capillaries.

Front 20

Pre capillary sphincter

Back 20

rings of smooth muscle fibres that regulate blood flow through capillaries located at the junction s between the Meta arterioles and the capillaries.

Front 21

vasomotion

Back 21

an intermediate contraction/relaxation of the precapillary sphincter so that at rest there is still blood flowing through 25% of capillary bed.

Front 22

3 types of capillaries

Back 22

continous capillaries
fenestrated capillaries
sinusoids

Front 23

Continuous capillary

Back 23

formed by endothelial cells with intracellular clefts for diffusion. found in smooth and skeletal muscle, connective tissue, and lungs.

Front 24

fenestrated capillary

Back 24

have pores in endotheliual cells for easier diffusion. found in kidneys, small intestine, endocrine glands, and ventricles of brain.

Front 25

Sinusoids

Back 25

have very large fenestrations. Basement membrane is incomplete or absent and it has massive intercellular clefts. found in liver spleen red bone marrow and endocrine glands.

Front 26

venules

Back 26

drain capillaries blood and begin the return flow of blood back toward heart.

Front 27

venules

Back 27

drain capillaries blood and begin the return flow of blood back toward heart.

Front 28

post capillary venules

Back 28

receive blood from capillaires. they are the sites of exchange of nutrients wastes and WBC emigration

Front 29

veins

Back 29

convey blood from the tissue back to the heart

Front 30

veins

Back 30

convey blood from the tissue back to the heart

Front 31

veins

Back 31

contain valves to prevent the back flow of blood

Front 32

veins

Back 32

convey blood from the tissue back to the heart

Front 33

veins

Back 33

contain valves to prevent the back flow of blood

Front 34

Vascular (venous) sinus

Back 34

are veins with very thin walls with no smooth muscle to alter their diameter.

Front 35

veins

Back 35

convey blood from the tissue back to the heart

Front 36

veins

Back 36

contain valves to prevent the back flow of blood

Front 37

Vascular (venous) sinus

Back 37

are veins with very thin walls with no smooth muscle to alter their diameter.

Front 38

Blood distribution

Back 38

they store blood and through venous vasoconstriction, can move blood to other parts of the body