Breaks down food into nutrients for energy, growth, and cell repair (Morales-Brown, 2025).

Includes key organs: mouth, esophagus, stomach, intestines, liver, and pancreas (Fowler et al., 2023).

Interacts with the circulatory system by delivering absorbed nutrients to cells through the blood.

Transports oxygen, nutrients, hormones, and waste products throughout the body (Staff, 2019).

Consists of the heart, blood vessels, and blood.

Works with the respiratory system to exchange oxygen and carbon dioxide in the lungs.

Brings oxygen into the body and removes carbon dioxide.

Main organs: nose, trachea, lungs, and diaphragm (Fowler et al., 2023).

Collaborates with the circulatory system to deliver oxygen to tissues and carry away carbon dioxide.

Produces hormones that regulate growth, metabolism, and reproduction.

Includes glands such as the pituitary, thyroid, adrenal, and pancreas.

Works closely with the nervous system to control body functions and maintain homeostasis.

Provides structure, support, and movement for the body.

Includes bones, muscles, tendons, ligaments, and joints.

Interacts with the nervous system to coordinate voluntary and involuntary movements.

Controls and coordinates body activities by sending electrical signals.

Consists of the brain, spinal cord, and peripheral nerves.

Works with the endocrine system to regulate body processes and respond to environmental changes.

Protects the body from pathogens and disease.

Includes white blood cells, lymph nodes, spleen, and antibodies (Fowler et al., 2023).

Works with the circulatory system to transport immune cells to sites of infection.

Enables the production of offspring.

Male system includes testes, penis, and associated ducts; female system includes ovaries, uterus, and vagina.

Works with the endocrine system to regulate hormones necessary for reproduction and development.