9.3 Blood Vessels

Question 1

what are blood vessels

Answer 1

tubes through which blood circulates in the body

Question 2

what are the types of blood vessels

Answer 2

-arteries
-veins
-capillaries

Question 3

what is the structure of arteries

Answer 3

-carry blood away from the heart
-they carry oxygenated blood (except for pulmonary artery)
-blood flows very fast and at high pressure in arteries
-they have thick muscular walls to withstand blood being carried at high pressures
-walls of arteries have elastic fibres
-they have a narrow lumen to maintain the high blood pressure
-they don’t have valves since high blood pressure prevent back flow

Question 4

what is the structure of veins

Answer 4

-carries blood towards the heart
-carry deoxygenated blood (except for pulmonary vein)
-blood flows slow
-has thin muscular walls with little elastic fibres
-has a large lumen
-valves are present

Question 5

functions of capillaries

Answer 5

-carries blood to and from the body’s cells
-role is to provide an exchange of oxygen, nutrients and waste products between the blood and body’s cells

Question 6

structure of capillaries

Answer 6

-the smallest blood vessels that connect arteries and veins
-carries both oxygenated and deoxygenated blood
-blood flows slowly in capillaries at low pressure
-one cell thick
-have a very narrow lumen. just wide enough for a red blood cell to pass through
-have very thin, permeable walls
-no valves

Question 7

identify these main blood vessels:
-pulmonary artery
-pulmonary vein
-vena cava
-aorta
-hepatic vein
-hepatic artery
-hepatic portal vein
-renal vein
-renal artery