How does the circulatory system avoid blood reflux?

What happens when you don´t include enough iron in your diet?

If you have suffered a heart attack you have to avoid..

Why does the heart have a big wall between both sides?

The reason why your heart sometimes beats very quickly is...

Blood vessels which allow exchange with cells are

exchange of gasses is done due to

If you bleed after a cut, it will clot thanks to...

blood collects most of the cell wastes in

In the laboratory, how do you recognise in the heart which are veins and arteries?

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