This University of Kansas Medical Center site defines the different kinds of cartilage and with a clickable list of microscopic slide photographs.

Sprains and strains are among the most common injuries in sports. Here are some facts about sprains and strains from the American Academy of Orthopedic Surgeons.

Read this passage and complete a five-question quiz pertaining to collagen mutations resulting in Osteogenesis Imperfecta.

Detailed description of how joints work and how arthritis affects them. Good look at the biology behind arthritis.

Practice test questions over the inherited disorder Marfan syndrome.

Wikipedia provides this encyclopedia article about collagen and its purpose in the human body.

One-page article answers questions about Marfan syndrome: its causes, risk factors, symptoms, diagnosis, and treatment.

Explains that glycoproteins and proteoglycans are components of the extracellular matrix and presents a table highlighting the differences between them.