1. Nervous system: Manages communication and control throughout the body. It is divided into the central nervous system (brain and spinal cord) and the peripheral nervous system (nerve networks).
2. Circulatory system: Responsible for transporting blood, oxygen, nutrients, and waste products throughout your body. It consists of the heart, blood vessels, and blood.
3. Respiratory system: Facilitates gas exchange, primarily oxygen intake and carbon dioxide expulsion. Key components include the lungs, trachea, bronchi, and diaphragm.
4. Digestive system: Breaks down food into nutrients and energy the body can use. Major components include the mouth, esophagus, stomach, small and large intestines, and accessory organs like the liver, pancreas, and gallbladder.
5. Muscular system: Enables movement, maintains posture, and produces heat. It consists of three types of muscles: skeletal, smooth, and cardiac.
6. Skeletal system: Provides structural support and protection for internal organs. It is made up of bones, cartilage, ligaments, and tendons.
7. Endocrine system: Regulates bodily functions through the release of hormones. Major glands include the hypothalamus, pituitary, thyroid, parathyroids, adrenals, pancreas, ovaries, and testes.
8. Immune system: Defends the body against infections, diseases, and foreign substances. Key components include white blood cells, antibodies, the lymphatic system, and the spleen.
9. Reproductive system: Is responsible for producing offspring and ensuring the continuation of the species
10. Urinary system: Filters waste products from the blood and excretes them as urine. The main components include the kidneys, ureters, bladder, and urethra.
