Module 5: Blood

Question 1

what is pacemaker cell

Answer 1

it is found in the heart rate and it controls the heart’s rhythm.

Question 2

what are SA node and AV node

Answer 2

The SA node regulates the heartbeat and the impulse travels to the AV node. At the AV node, the impulses are delayed.

Question 3

what factors contribute to the control of heart rhythm.

Answer 3

1) parasympathetic and sympathetic
2) hormone ex) adrenaline
3) body temperature

Question 4

comparison of artery and vein

Answer 4

1) artery is thicker than vein.
2) artery has no valves and veon has no sphincters.
3) artery has narrower lumen and vein has wider lumen.
4) arteries are elasticity

Question 5

during the systole, the pressure of the left ventricle is high or low?

Answer 5

high. heart contracting and emptying

Question 6

during the diastole, the pressure of the left ventricle is high or low?

Answer 6

no pressure.

Question 7

true or false

during the diastole, arteries have no pressure.

Answer 7

false. because arteries must have some blood pressure

Question 8

when oedema occurs?

Answer 8

1) if there is not enough skeletal muscle activity
2) heart failure - not able to pump blood effectively
3) if there is not enough venous return

Question 9

what is the role of sphincters

Answer 9

it controls the flow of blood between arterioles and venules