Answer: These layers are surrounded by the pericardium, a thin outer lining protecting your heart. There are four chambers that make up the heart – two on the left side and two on the right. The two small upper chambers are the atria. The two larger lower chambers are the ventricles
Answer:
12 Thoracic Vertebrae
Explanation:
The twelve thoracic vertebrae protect the heart and lungs along with the connecting rib cage.
