Symptoms of iron-deficiency anemia are related to decreased oxygen delivery to the entire body and may include: 1  Being pale or having yellow sallow skin. 2  Unexplained fatigue or lack of energy. 3  Shortness of breath or chest pain, especially with activity.  Unexplained generalized 1  weakness. Rapid heartbeat.  Pounding or whooshing in the ears.
The thoracic cavity contains the heart, the lungs, and some abdominal organs. The thoracic cage provides attachments for muscles of the neck, thorax, upper limbs, abdomen, and back. The thorax moves up and down to allow breathing, so it is one of the most dynamic regions of the body.
The thoracic cavity is coated with a serous membrane, which exudes a thin serum or fluid. This membrane, which contains nerves, blood vessels and lymph channels, covers the lungs as well as parts of the heart, vessels and esophagus. Each lung within the thoracic cavity is contained within a pleural cavity.