Key structures involved in the conduction of the impulse through the heart are the sinoatrial (SA) node, atrioventricular (AV) node, bundle of His, right and left bundle branches, and Purkinje fibers. The impulse starts at the SA node, travels to the AV node, then to the bundle of His, bundle branches, and Purkinje fibers, resulting in the contraction of the atria and ventricles. This synchronized contraction is essential for the efficient pumping of blood throughout the body.

Transitive definition is - characterized by having or containing a direct object.

Round 4.1983 to the nearest hundreth is 4.20

4.19 to the nearest hundreth is 4.19

0.25, -4, -4.5 from greatest to least is: 0.25, -4, -4.5