3. Describe the pathway that depolarization takes as it travels through the heart.

Depolarisation occurs when the nerve cells reverses their charges.

Explanation:Depolarization occurs in the four chambers of the heart.Both atria first and both ventricles.The sinoatria (SA) node on the wall of the right atrium initiates Depolarization in the right and left atria,causing contraction,which is symbolized by the P wave on an electrocardiogram.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.