How do our body systems depend on each other?

They all work to support one another and one system can not malfunction and still allow the body to maintain a state of homeostasis (a normal state of healthy being).

Respiratory System - Transports O2 to the rest of the body and expels Co2 (Ex. Lungs)

Lymphatic System - Cleanses the body of toxins and impurities (Ex. Lymph nodes)

Digestive System - Responsible for digestion and absorption of necessary nutrients needed to feed the body.

Cardiovascular System - Transports blood and O2 to the body.

Nervous System - Responsible for sending and receiving chemical messages to the rest of the body for functioning.

Skeletal System - Provides mobility and support for the body.

Musculoskeletal System - Provides movement and strength for the body.

Integumentary System - Provides protection to the body in the form of skin.

Reproductive System - Responsible for reproduction.

Urinary System - Responsible for flushing the system of fluids/impurities.

You cant have just one system "shut down" without it eventually affecting the other systems.

Unfortunately this is a huge question, hard to explain. They just do, they all rely on each other to function if one fails, the others go down with it, its team work! They all work together for the one result, Life.