List the four chambers in an animal's heart.  

Expert Answers

An illustration of the letter 'A' in a speech bubbles

A four-chamber heart is composed of two atria and two ventricles. The function of each chamber is briefly described below.

  • Oxygen-poor blood that has been used by the cells is delivered back to the heat via the right atrium.
  • The right atrium pumps this oxygen-depleted blood to the right ventricle.
  • The right ventricle then pumps the blood to lungs, where oxygen is received.
  • The oxygenated blood is brought back to the heart via the pulmonary veins.
  • The pulmonary veins lead the blood to the left atrium.
  • The left atrium pumps this oxygen-rich blood to the left ventricle.
  • The left ventricle then pumps the oxygenated blood to the body.

The oxygen in the blood is then used by the mitochondria of the eukaryotic cells in a process known as cellular respiration. During cellular respiration, oxygen gas and the sugar glucose are converted into water, carbon dioxide gas, and an energy source called adenosine triphosphate (ATP).


Approved by eNotes Editorial Team