B. Select from the words into the boxes to describe the cardiac cycle.
The heart receives an___ signal triggering the cardiac muscle cells in the____ to____ The signal___before passing onto the____ so the blood is pumped through the ____. This is the _____phase. The heart then____ in ____ and fills again with blood.
Atria
Contract
systolic
Relaxes
Pauses
Electrical
Diastole
body
ventricles
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Answer:
1.Electrical
2.Atria
3.Contract
4.Pauses
5.ventricles
6.systolic
7.body.
8.Relaxes
9.Diastole