Unit 1 - The Human Body PDF

The Human Body How does our body work? The human body is an amazing and complicated piece of machinery! It is made of multiple interacting systems that work together to keep the body working. Our organism consists of various systems made up of groups of organs that work toward the same purpose. It...

The Human Body How does our body work? The human body is an amazing and complicated piece of machinery! It is made of multiple interacting systems that work together to keep the body working. Our organism consists of various systems made up of groups of organs that work toward the same purpose. It is the brain that controls and manages the functioning of our body to ensure everything operates perfectly. Observe the diagram that shows the organisation of the human body: The body is made up of thousands of cells; Cells with the same function form a tissue; Tissues group together to form organs with specific functions; Organs that work toward the same goal belong to the same system; The systems operate simultaneously and form our body. 1  Unit 1- The Human Body 1.1 The Circulatory System All animals need to move important fluids through their body. The fluids move through what is called a circulatory system. The fluids carry nutrients and gases, like oxygen, that keep the animals alive. The fluids also remove wastes from the body. In humans and some other animals they also carry substances that help the body fight infection. Cambridge Primary Science Learner’s Book 6 - pages 4 - 11 2  Unit 1- The Human Body 1.2 The Respiratory System All animals need a steady supply of oxygen in order to live. Oxygen is a gas found in air. It helps to turn food into energy. This process creates another gas-carbon dioxide. Because carbon dioxide is a waste product, it must be removed from the body. The respiratory system is the body’s way of breathing in oxygen and breathing out carbon dioxide. Cambridge Primary Science Learner’s Book 6 - pages 12 - 18 3  Unit 1- The Human Body 1.3 The Reproductive System All living things reproduce, or create offspring. Animals’ offspring are often called babies. The body parts that allow animals to create babies belong to the reproductive system. Cambridge Primary Science Learner’s Book 6 pages 19 - 23 4  Unit 1- The Human Body 1.4 Diseases Diseases, also called illnesses or sicknesses, are conditions that make people unhealthy. Human diseases fall into two major groups: infectious diseases and noninfectious diseases. Infectious diseases are contagious. Many human diseases do not result from pathogens. These diseases are called noninfectious. They are not contagious. Cambridge Primary Science Learner’s Book 6 pages 24 -29 5