What are the main organs / systems in the human body?

Key systems and their primary components include: 1. Nervous System – Includes the brain, spinal cord, and peripheral nerves. 2. Cardiovascular System – Comprises the heart and blood vessels. 3. Respiratory System – Involves the lungs and airways. 4. Digestive System – Consists of the mouth, esophagus, stomach, intestines, liver, and related organs. 5. Musculoskeletal System – Encompasses bones, muscles, and connective tissues. 6. Endocrine System – Made up of glands (like the thyroid and adrenal glands) that produce hormones. 7. Urinary System – Includes the kidneys, bladder, and related structures. 8. Reproductive System – Comprises the organs involved in sexual reproduction. Each of these systems works in unison to maintain the body’s overall function and health.