Vessels

Question 1

Anastomeses

Answer 1

When veins come together

Question 2

Arteriovenous Shunts (AV)

Answer 2

From artery to vein without going through capillary

Question 3

Collateral Circulation

Answer 3

If one plugs blood can still get around another way

End arteries don’t have this (Heart, brain)

Question 4

Artery pressure

Answer 4

120/80 mmHg, pulse created by pressure spike

Question 5

Types of vessels

Answer 5

Elastic, Muscle/distributing, Arteriole

Question 6

What is the Tunica Externa?

Answer 6

Vaso Vasorum- vessels own vessels

Elastic Lamina- Give vessel flexibity

Question 7

Tunica Media

Answer 7

Thick smooth muscle in arteries
Thin smooth muscle in veins
Help with vaso constrict/dilation
Innervated by parasympathetic

Question 8

Tunica Intima

Answer 8

Where the endothelium is, inner lining

Question 9

Capillaries

Answer 9

End arterioles- lose t. externa and t. media
Just endothelium
Precapillary sphincter
Limited pressure 35-15 mmHg

Question 10

What are the three types of capillaries?

Answer 10

1. Continuous: Very little holes, don’t release stuff
2. Fenestrated: Small holes everywhere, let fluid leak
3. Sinusoid: Big holes, lots leaks out, found in liver

Question 11

Veins

Capacitance vessels

Answer 11

Lo pressure: 0-15 mmHg
Mostly superficial
Same structure but NO elastic lamina
One way valves inside

Question 12

What is Venae Comitantes?

Answer 12

Veins wrap around artery towards heart

Question 13

Issues with Veins

Answer 13

Varicose Veins: valves fail so blood falls back and pools
Deep Brain Thrombosis: embolus, clot forms, lodges in bad spot
Atherosclerosis: decreases diameter of arteries
Aneurism: big bulging of T. Intima and possible burst