If the average heart rate is 75 beats per minute, a human heart would beat approximately 108,000 times in one day, more than 39 million times in one year, and nearly 3 billion times during a 75-year lifespan.

The lymph does not have a pump like the heart to help keep it circulating, although the presence of one-way valves within the lymph vessels do prevent back flow of lymph.

The sacroiliac (SI) joint is the largest axial joint in the body and is formed by the crescent-shaped articulation between the medial surface of the ilium and the lateral surface of the sacrum.

The lumbar spine is typically comprised of five vertebrae that lie between the pelvis and the ribcage.

The thymus is a bilobed organ found in the space between the sternum (breastbone) and the aorta of the heart. The word thymus originated from the Greek word thymos, which means “soul” or “spirit”.