Human Skeletons Our body has a structure of 206 bones which is called the Skeletal system. These bones act like a scaffolding and help in giving our body the shape we see it in because without the bones our body would collapse and and become a shapeless mass. In the centre the skeleton is supported by a spine which comprises of different pieces of bone, called Vertebrae, connected to each other....

Glands and Hormones Our body has various glands which secrete chemical substances. These include the Pituitary gland, Thyroid gland, Pancreas, Adrenal glands, Ovaries, Testes etc. Glands are primarily of two types i.e. Endocrine glands and Exocrine glands. Endocrine glands secrete substances called Hormones which are sent directly into the blood stream. On the other hand Exocrine glands release their substances through tubes into the intestines or onto the skin. Examples of...

The Lymphatic System The Lymphatic system is a system of vessels spread all over our body. This system works in close coordination with blood especially with white blood cells. It is responsible for collecting surplus fluid, called Lymph fluid, from our body alongwith other foreign particles and chemical waste. Like the arteries and veins, the Lymph vessels too branch out in the end to form lymph capillaries, these capillaries collect excess...

Blood Groups and Blood Pressure All blood looks red in colour but in reality its composition may be different. Blood contains red cells and on the surface of these cells are factors called Antigens. Antigens are of two types i.e. antigen ‘A’ and antigen ‘B’. Blood which contains cells with antigen ‘A’ is called blood type A and blood which contains cells with antigen ‘B’ is called blood type B. There...

Heart and Blood Blood cells carry nourishment to all parts of our body through a network of arteries and veins and an average adult body contains about 4.5 litres of blood. Blood is red in colour and is made up of three types of cells i.e. Red cells, White cells and Platelets and a watery liquid called Plasma. These cells are so small that. a drop of blood may contain millions...

The Urinary System Waste products from the body are regularly let out both in liquid and solid form. The system in the body which is responsible for the production of liquid waste or urine is called the Urinary system. The prime organs in this system are called the Kidneys. All animals with a backbone arid man have two kidneys. Kidneys look like large sized brown beans. Blood which flows from the...

Minerals and Vitamins Chemicals which help our body to stay healthy are called vitamins. These are of six types i.e. Vitamins A, B, C, D, E and K. Vitamin B can further be broken down into a number of types. Vitamins are present in our body but in very small quantities and they need to be supplemented frequently. Different types of foods contain different types of vitamins which is why a...

The Digestive System As we bite into something we want to eat and begin to chew, we initiate the activity of our digestive system. As our teeth crush the food, a watery substance called ‘Saliva’, from our salivary glands, gets mixed into the food to help us in swallowing it. Once we swallow the food, it travels down into our stomach through a tube called the Oesophagus. The oesophagus is located...