Reading comprehension No.3

1. Bone cells combine with other bone cells to created the bone tissues.

2. An organ is a group of tissues that work together to do a certain job, for the body. Some of the human body's organs include the stomach,lungs, heart, kidneys, brain and liver.

3. Respiratory and circulatory system.

4. Respiratory system. The human respiratory system is a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary organs of the respiratory system are lungs, which carry out this exchange of gases as we breathe.

5. The respiratory includes the lungs and all the body parts that allow us to breathe in oxygen and exhale carbon dioxide. The circulatory system includes the heart and all the body parts that help move around the blood around the body.