They all work together as one.
The digestive and excretory systems work together by gathering nutrients from food and processing waste out of the body. Each system does its portion of the workload.
The work together by.....
The endocrine and nervous system work together to maintain homeostasis by sending each other signals and messages to know when the body needs something.
The human body is made of organs. Certain organs work together to form systems. We each have a respiratory and a Circulatory system, Digestive system and Excretory System.
A system is a group of organs that work together like the digestive system. While a body is a group of systems that work together. You are not just your digestive system but also your musculoskeletal system, urogenital system, endocrine system and nervous systems that work all together.
Body systems work together to keep the body healthy and the body systems are interdependent (they rely on each other).
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The organs work together by
Body systems are groups of organs that work together.
Body parts have to work together to do an activity because they are all one system. Without them working together, something may not function properly. This might be the lungs, or spine.
Most of the systems are interconnected so they work together, like respiratory system works with the circulatory system.