We don't have any scientific explanation why the heart and circulatory system is the way it is, but we do know how it works. One side of the heart pumps blood from the heart to the lungs and back to the other side of the heart, getting rid of carbon dioxide and picking up oxygen. Then the other side of the heart pumps the oxygenated blood to every other part of the body and back to the heart again, getting rid of the oxygen and picking up carbon dioxide and other waste.
No, a sagittal cut would not be done to achieve anterior and posterior sections of the heart. A transverse cut would be more appropriate to separate the heart into anterior and posterior sections. A sagittal cut divides a structure into left and right portions.
SEPTUM
The term for the 4 sections of the heart muscle is the cardiac muscle.
In your heart, the top two hollow sections are called atrium and the lower two are ventricles.
pull them apart.
veins and arteries
It is called plates.
plate tectonics
The lithosphere is made up of the "upper mantle" and earth's crust.The lithosphere is broken into separate sections called plate tectonics or tectonic plates.
Earths lithosphere is made up of upper mantle. The earths lithosphere is broken into separate sections and it is called as tectonic plates or plate tectonics.
veins and arteries
The Fold 'n' Stax Dividers will creat sections and come with 6 sections in some sets.