Biology is multidisciplinary area of study that encompasses all aspects of living organism and their environment. This short course is one in a series that Introduces basic Biology concepts. In this course, you will understand how our blood moves around the body, the basic components of the blood and how the heart functions. You will also learn how our Respiratory system brings Oxygen towards our lungs, and how our lungs remove gases that are not needed by our cells. Finally, you will learn the basics of how our body will defend itself against diseases.