cardiovascular system

Question 1

structure of an artery?

Answer 1

1. have a lumen
2. thick muscular layer
3. thick elastic layer

Question 2

structure of a vein?

Answer 2

1.have valves
2.thin muscle layer
3.have a wider lumen

Question 3

structure of capillaries?

Answer 3

1. are tissues
2. a narrow lumen
3. no outer layer

Question 4

role of erythrocytes?

Answer 4

contain haemoglobin which is important to transport oxygen

Question 5

role of leukocytes?

Answer 5

white blood cells which are involved with immunity and engulf pathogens

Question 6

role of thrombocytes ?

Answer 6

form blood clots to prevent excessive bleeding

Question 7

what happens when the atria contracts?

Answer 7

pressure increases moving blood to the ventricles via the bicuspid and tricuspid valves