Human Body Systems

The biology of the human body is divided into various systems that work together to create its form and function (anatomy and physiology).  It helps to understand how the body works, at least generally, so that we can make educated choices about how best to take care of ourselves.

Here is a list of our body systems and a brief description of what each one does for us.

  • The Skeletal System includes bones, cartilage, tendons, and ligaments. It is the body’s structure and also offers protection, especially to vital organs.
  • The Integumentary System includes the skin, hair, nails, and fat. Among its responsibilities are containment and protection of other parts of the body.
  • The Muscular System includes three categories of muscles – skeletal, smooth, and cardiac. This system maintains posture, produces heat, and provides for movement.
  • The Nervous System includes the brain, the spinal cord, and peripheral nerves. It is responsible for collecting, transporting, and processing information.
  • The Circulatory System includes the heart, lungs, blood, and blood vessels. It is responsible for transporting blood from the heart and lungs to the rest of the body and vice versa.
  • The Digestive System includes organs such as the stomach, intestines, esophagus, salivary glands, liver, gallbladder, pancreas, rectum, and anus. Its responsibility is to digest and process food.
  • The Urinary System includes the kidneys, ureters, bladder, and urethra. Fluid balance, electrolyte balance, and excretion of waste is performed by these organs.
  • The Lymphatic System includes the lymph along with nodes and vessels. It is responsible for immune responses and developing antibodies.
  • The Endocrine System includes hormones and a variety of glands – endocrine, pituitary, thyroid, parathyroid, adrenal, and pineal. This systems allows the body to communicate within itself.
  • The Reproductive System includes sex organs such as ovaries, fallopian tubes, uterus, vagina, mammary glands, testes, vas deferens, seminal vesicles, and prostate. Propagation is its main purpose.
shapes of human body showing different systems

I will go into more detail as to how each of these systems work in future posts.