Investigate a published case study that deals with conditions affecting a biological system.

Write a 1,050- to 1,500-word paper describing a single biological system of the body, such as respiratory or immune.

Include the following in your paper:

• Describe normal, healthy functioning.
• Explain how unhealthy lifestyle choices can compromise the system.
• Describe the biological system discussed in the case study and this system’s normal functioning in a healthy person.
• Evaluate how vulnerabilities in the system can lead to behavioral problems, impairments, or illnesses.
• Recommend behavioral or lifestyle changes to improve health.

Format your paper consistent with APA guidelines.

Cite at least three peer-reviewed sources.