The Heart and Blood Vessels

Which side of the heart is more muscular and why?

The left side

Pumps blood all around body at high pressure.

Name of electrical activity that starts the cardiac cycle?

Sino Atrial Node

Which of these blood vessels has the highest pressure

1) Aorta

2) Artery

3) Arterioles

Aorta - blood has just been pushed through into aorta, point of highest pressure

Name 5 differences between arteries and veins

1) Arteries have more muscley walls - to maintain high pressure

2) Veins have valves to prevent backflow

3) Arteries have more collagen and elastin to withstand pressure

4)

5)