arteries, veins and capillaries

Question 1

describe the artery wall

Answer 1

the artery wall is much thicker compared to the walls of veins as blood is coming directly from the heart and must withstand a large amount of pressure

Question 2

describe the vein wall

Answer 2

the vein wall is much thinner/smaller than artery walls as the pressure of blood passing through is much lower

Question 3

what do arteries do

Answer 3

carry blood away from the heart

Question 4

what do veins do

Answer 4

carry blood towards the heart

Question 5

do arteries have valves

Answer 5

no

Question 6

do veins have valves

Answer 6

yes, to prevent and stop the backflow of blood. valves keep the blood flowing in the right direction

Question 7

how do valves work

Answer 7

• blood is pumped past the valves
• due to gravity blood attempts to flow backwards
• this blood is trapped behind these valves
• the heart contracts pumping blood through

Blood is pumped past the valves. Due to gravity, the blood will attempt to flow backwards, however, this blood will get caught behind the valves. The heart contracts pumping blood through releasing the trapped blood and the process continues

Question 8

structure of capillaries

Answer 8

• capillaries cover alveoli and are one cell thick to allow the gaseous exchange to occur
• capillaries are made up of squamous epithelium

Question 9

what do capillaries do

Answer 9

are tiny vessels that carry blood between cells