The Heart

• The heart is enclosed in a protective sac of tissue called the...

  Pericardium
• In the walls of the heart, 2 layers of epithelial and connective tissue form around a thick layer of muscle called the myocardium
• Contraction of the myocardium pump blood
• The heart has 4 chambers

  • 2 Atria
  • 2 Ventricles
• Wall that divides the heart in half?

  Septum
• There are 2 chambers on each side of the septum
• The upper chamber, which receives the blood is the...

  Atrium
• The lower chamber, which pumps blood out of the heart, is the..

  Ventricle