CV 2

Question 1

*what are the three layers of blood vessel

Answer 1

1) adventitia (primarily collagen fibres)
2) media (smooth muscle)
3)intima (simple squamous epithelium)

Question 2

*what is the difference between a muscular artery and a medium sized vein?

Answer 2

difference is the thickness of layers

Question 3

*what is an elastic artery and examples pf an elastic artery

Answer 3

-tolerates high pressure changes during cardiac cycle
-recoil during diastole to propel blood forward
ex: aorta, brachiocephalic trunk, pulmonary trunk
-media has more elastic CT fibres
-intima is thicker but still has endothelium

Question 4

*muscular artery example and what it is

Answer 4

-transports blood to skeletal m. nd organs
ex: radial, ulnar, brachial, femoral
media layer has more smooth muscle
-vessel diameter under control of autonomic nervouse system

Question 5

*arterioles

Answer 5

-control blood flow between arteries and capillaries by responding to local conditions
-adventitia transitions to thinner layer of CT
-media turns into incomplete smooth muscle layers

Question 6

*capillaries

Answer 6

-smallest and most delicate vessel
-only vessel where nutrient/gas exchange occurs between blood and tissues
-lacks adventitia and media; intima is thin… good because less stuff getting in the way for nutrients and gas exchange

Question 7

2 types of capillaries

Answer 7

1) continuous capillaries
- endothelial cells connected by tight junctions and desmosomes
2)fenestrated capillaries
-has pores which permit very rapid exchange of fluid and solutes

Question 8

*what is the role of precapillary sphincter

Answer 8

regulate entry and exit in region
-when open they maintain blood pressure
-smooth muscle