Deoxygenated blood arrives at the heart via the main vein from the __________. It gathers in the right-hand side atrium. The valve opens and blood passes into the right __________.
The valve between the ventricle and __________ closes and the heart muscle contracts forcing the blood through the valve into the __________ to the lungs.
__________ blood then returns to the left-hand side of the heart via a vein. The blood gathers in the left __________ before passing through the valve into the left ventricle.
The heart __________ contracts again, this time harder. The blood is pumped through another valve and along the main __________ to the body, called the aorta.
And the cycle begins again...
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