Write a 1,050- to 1,500-word paper describing a single biological system of the body,

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.