Humans have many organ systems such as the respiratory system, circulation system and others. As well as organs, there are so many organs in the human body Children should know as much as possible about these organs and their functions, but learning by just read will quickly make you forget.
The solution is learning which also requires thinking to understand it, like working on a respiratory system crossword like below:
Every living thing needs air to breathe, and breathing is the duty of the lungs to breathe oxygen, and then emit carbon dioxide. That is a little picture of the respiratory system. To make it easier to learn all that we can open a science book but it will be boring so that to be more fun, we can learn about the respiratory system by filling in the crossword puzzle.
Blood contains a lot of nutrients and oxygen to circulate to all the tissues in the body and it is the duty of the heart to pump blood in order to achieve it all from the legs to the head, no exception the muscles, arteries and veins.
After doing on the crossword indirectly you learn to remember and understand about the systems and organs in the body. So learning is fun if we do it with games like the respiratory system crossword above.