All animals interact with their environment. But, what does "interact with the environment" mean?

It means that all animals can detect changes in their environment and they can react to those changes.

To interact with the environment, animals need sense organs, a nervous system and a locomotor system.


Animals detect changes in the environment with their sense organs:

  • Animals have ears to listen (to capture sound vibrations).

  • Animals have eyes to see (to detect light).

  • Animals have tongues to taste (to detect flavours).

  • Animals have noses to smell (to detect smells).

  • Animals have skin to feel (to distinguish between cold or hot, between a living thing or a non-living thing).


The nervous system interprets the information that comes from the sense organs and tells the body how to react. The nervous system includes the brain and the nerves, and this is how it works:

  1. The nerves receive information from the sense organs and send it to the brain.

  2. The brain interprets that information and generates a reaction: an order to the locomotor system (the muscles) to react.

  3. The nerves transport that order (how to react) to the locomotor system (the muscles).

  4. The muscles move.

How the nervous system works - Interaction.jpg


It is made up of muscles and bones:

  • Muscles carry out the order from the nervous system; y ey transform those orders into movement. If you want to know more about the muscles, click here.

  • Bones support our body and protect the organs. If you want to know more about the bones, click here.

Let's watch a video about the whole process.

Do you want to check what you have learned? Go to the games section.