Human body is made up of countless millions of cells. Food is needed to build up new cells and replace the worn out cells. However, the food that we take must be changed into substances that can be carried in the blood to the places where they are needed. This process is called digestion. The first digestive process takes place in the mouth. The food we eat is broken up into small pieces by the action of teeth, mixed with saliva, a juice secreted by glands in the mouth. Saliva contains digestive juice which moistens the food, so it can be swallowed easily. From the mouth, food passes through the esophagus (the food passage) into the stomach. Here, the food is mixed with the juices secreted by the cells in the stomach for several hours. Then the food enters the small intestine. All the time the muscular walls of the intestine are squeezing, mixing and moving the food onwards. From the text above, we imply that ....

Why Seawater is Salty? Most of our planet’s surface is covered in water – salt water. The oceans that support so much of Earth’s life are around 3.5% sodium chloride – 50 million billion tonnes o...

Biodiesel is a clean burning substitute for petroleum based diesel fuel. Biodiesel is made of vegetable oil. To make or manufacture Biodiesel, you must first start with raw materials. The raw materia...

Biodiesel is a clean burning substitute for petroleum based diesel fuel. Biodiesel is made of vegetable oil. To make or manufacture Biodiesel, you must first start with raw materials. The raw materia...

Human body is made up of countless millions of cells. Food is needed to build up new cells and replace the worn out cells. However, the food that we take must be changed into substances that can be ca...

Have you ever wondered how people get chocolate from? In this article we'll enter the amazing world of chocolate so you can understand exactly what you're eating. Chocolate starts with a tree call...