____ blood enters the heart via the ____. It passes through the ____ atrium and into the right ventricle. The blood then passes through the ____ which leads to the lungs. Here the blood collects oxygen making it ____. Then the blood goes back into the heart via the ____, into the ____ down to the left ____ and out to the body via the ____. There are two circulatory pathways. Firstly, the ____ which is the loop where there the blood goes to the ____ to collect oxygen. The ____ is where the blood goes to the rest of the body. ____ take blood away from the heart. ____ take blood back to the heart. Heart rate is measured in ____ When we exercise, our heart rate ____ As our heart rate increases, so does ____ and therefore ____. Stroke volume is the ____ of blood pumped out of the heart per beat. Cardiac output is the ____

Circulatory System

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