Health & Medicine Heart .

1. Heart 2. Human Heart 3. In humans, the heart has four chambers: two upper chambers (the atria) and two lower ones (the ventricles). The right atrium and right ventricle…

Health & Medicine Heart .

1. In humans, the heart has four chambers: two upper chambers (the atria) and two lower ones (the ventricles). The right atrium and right ventricle together make up the…

Health & Medicine Heart .

1. In humans, the heart has four chambers: two upper chambers (the atria) and two lower ones (the ventricles). The right atrium and right ventricle together make up the…