* Skeletal system: This system includes the bones and cartilage of the body. It provides support, protection, and allows for movement.
* Muscular system: This system includes all of the muscles in the body. Muscles allow for movement, heat production, and protection of organs.
* Nervous system: This system includes the brain, spinal cord, and nerves. It controls all of the body's functions, from movement to thought.
* Endocrine system: This system includes the glands that produce hormones. Hormones regulate many of the body's functions, including growth, reproduction, and metabolism.
* Cardiovascular system: This system includes the heart, blood vessels, and blood. It pumps blood throughout the body, delivering oxygen and nutrients to cells and removing waste products.
* Respiratory system: This system includes the lungs and airways. It allows oxygen to enter the body and carbon dioxide to leave the body.
* Digestive system: This system includes the mouth, esophagus, stomach, intestines, and anus. It breaks down food into nutrients that the body can absorb.
* Urinary system: This system includes the kidneys, ureters, bladder, and urethra. It filters waste products from the blood and produces urine.
* Reproductive system: This system includes the sex organs. It produces gametes (eggs and sperm) and allows for reproduction.
* Lymphatic system: This system includes the lymph nodes, lymph vessels, and lymphoid tissues. It helps to fight infection and disease.
* Integumentary system: This system includes the skin, hair, and nails. It protects the body from the environment and helps to regulate body temperature.
* Immune system: This system is a network of cells, tissues, and organs that works together to protect the body from infection and disease.
