Vessels And Circulation

Front 1

innermost layer
endothelium
connective tissue
internal elastic membrane (in arteries)

Back 1

Tunica intima

Front 2

Smooth muscle cells arranged
circularly around the blood vessel (middle of muscle)

Back 2

Tunica Media

Front 3

Outermost layer; Connective tissue
Large blood vessel walls require their own blood supply, called vasa vasorum

Back 3

Tunica adventitia (externa)

Front 4

Smooth muscle contract , decrease in blood flow

Back 4

Vasoconstriction

Front 5

Smooth muscle relax -increase
in blood flow

Back 5

Vasodilation

Front 6

Always carry blood away form the heart _ carry oxygenated blood --> red

Back 6

Arteries

Front 7

Always carry blood toward the heart -->> Deoxygenated blood >>BLUE

Back 7

VEINS

Front 8

Sites of exchange of gases, nutrients, wastes, etc. within tissue

Back 8

Capillaries

Front 9

Distinguinshing arteries from veins .....

Back 9

1. Walls of arteries are thicker than those of veins

2. Walls of arteries contract , causing lumen to appear smaller, and walls retain circular shape, walls of veins are thinner, and tend to collapse easier

3. Due to contraction of arterial wall, endothelium appears to have many folds

Front 10

Elastic or conducting arteries
Largest diameters
Tunica media with more elastic tissue than muscle
Pressure is high and flucuates between systole and diastole

Back 10

ELASTIC ARTERY

Front 11

Medium musular
Thicker walls due to 25-40 layers of smooth muscle
Branch into ARTERIOLES

Back 11

Muscular Artery

Front 12

SMALL arteries
Tunica media with one to two layers of smooth muscle &
Are capable of vasoconstriction and vasodilation
(regulates blood flow into capillaries)
Transport blood from the small arteries to capillaries

Back 12

ARTERIOLES

Front 13

The smallest most delicate blood vessels
Interconnect arteriols with venules
Only vessels that allow gas exchange of materials between blood and the surrounding interstitial fluid

Back 13

Capillaries

Front 14

Drain blood from capillaries
contain endothelial cells and a few muscle cells
As diameter of venules increase amount of smooth muscle increases.

Back 14

Venules

Front 15

prevent backflow of blood

Back 15

valves

Front 16

dysfunctional valves cause pooling of blood in lower extremities.

Back 16

varicose veins

Front 17

Thinner walls compared to arteries contain less elastic tissue and fewer muscle cells

Back 17

Medium and large veins

Front 18

Transports blood between the heart and lungs is the

Back 18

Pulmonary circuit

Front 19

Transports blood between the heart and all other tissues is the

Back 19

Systemic circuit

Front 20

Leaves the left ventricle to form the
ascending aorta
coronary arteries branch from the aorta and supply the heat
**aortic arch
**descending aorta
**consists of thoracic aorta and abdominal aorta

Back 20

AORTA

Front 21

Drains head, neck, thorax, and upper limbs

Back 21

Superior vena cava

Front 22

Drains abdomen, pelvis, and lower limbs

Back 22

Inferior vena cava

Front 23

drains heart

Back 23

coronary sinus

Front 24

drains dural venous sinuses , and the veins of the anterior head, neck , face, and neck

Back 24

Internal jugular veins

Front 25

Drains the posterior head and neck

Back 25

External jugular veins and vertebral veins