Unit III

This chapter talks about digestion and absorption. The structure of the human alimentary canal is discussed. We will learn the role of digestive enzymes in the digestion process. It also covers some nutritional and digestive disorders.

This chapter gives a fair idea about respiration and how it is different from photosynthesis. A comparative study of aerobic and anaerobic respiration highlights the common phases both types go through.

This topic sheds light on body fluids and circulation. We will understand the composition of blood. It explains the different blood groups. The lymphatic system, cardiac cycle, and structure of the human heart are also discussed through diagrams.

This chapter talks about excretion. We will understand the concept of excretion and the excretion process in plants and animals. We will also study excretory organs in animals and excretory system of humans through diagrams.