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.
Relevance. Rating Newest Oldest. Best Answer: Increase. When the intercostal muscles and the diaphragm contract they increase the size of the thoracic cavity, causing negative pressure in the lungs, causing inspiration.Source(s): Dr. T Â· 7 years ago.ating Newest Oldest. Best Answer: Increase. When the intercostal muscles and the diaphragm contract they increase the size of the thoracic cavity, causing negative pressure in the lungs, causing inspiration.