Please select a game to play from the left menu

HUMAN BODY

Sense Organs
We have five senses
  1. Eyes: Our eyes work like cameras and enable us to see objects around us. Each eye has a pupil that lets light to enter the eye. Iris is the part that surrounds the pupil. The lens inside the eye causes the light to bend and form an image on the retina, located at the back of the eye. The optical nerve carries this image to the brain where it gets interpreted.
  2. Ears: Our ears help us to hear the sounds that are produced around us. The outer ear is shaped well to collect sounds that travel along the ear canal to the eardrum. The eardrum vibrates according to the sound. This causes 3 small bones connected to it (called hammer, anvil, stirrup) to vibrate too. This in turn makes the cochlea (a coiled tube filled with liquid) vibrate. These vibrations are then picked up by the nerve cells which carry it to the brain where the sound is interpreted.
  3. Nose: Our nose helps us to smell food and other items. Inside the nose, towards the top, there are odor-sensitive nerve cells containing hairs with a mucus lining. When the odor from an object rises up the nose, it gets trapped by the hair and gets dissolved in the mucus. The nerve cells then carry these signals to the brain, where the odor is interpreted.
  4. Tongue: Our tongue has thousands of taste buds that can pick up salt, sweet, sour and bitter tastes. These taste buds get stimulated by the chemicals in the food we eat. The nerve cells attached to the taste buds then pass on these messages to the brain where they get interpreted.
  5. Skin: Our skin covers the entire body and helps us to feel the objects we touch. The nerve endings present in the skin all over the body enable us to feel heat, cold, pain, pressure and texture of the objects that we come in contact with. These nerve endings pass on the messages to the brain where they get interpreted.
The Digestive System
The food that we eat gets broken down into smaller food particles and gets converted into substances that can be easily absorbed by the blood. The blood then carries these nutrients to various parts of the body for providing energy. The digestion process begins when we put food in our mouths and ends when the food has beed absorbed into the bloodstream. The following organs help in the digestion process.
  1. Mouth: Food in our mouth gets chewed by the teeth and gets mixed with saliva to make it easier to swallow.
  2. Food Pipe(Esophagus): Food that is swallowed, travels down this muscular tube into the stomach.
  3. Stomach: It is a big bag containing acids that kill any bacteria in the food and then churn the food into a paste which gets passed into the small intestine.
  4. Liver and Pancreas: Juices from these organs act on the food in the small intestine and separate the waste substances in the food from the useful substances.
  5. Small Intestine: Useful substances get absorbed into the blood by finger-like structures called villi present on the walls of the small intestine.
  6. Large Intestine: Waste substances pass into the large intestine where excess water is absorbed. The solid waste then gets expelled through the rectum.

Nervous System
The Nervous System is our body's control system made up of a network of nerves that send, receive and process messages called nerve impulses. These nerve impulses tell the muscles and organs what to do and how to respond to the environment. It consists of the following parts.
  1. Brain: Brain is the main control center of the whole body. It is protected in a hard bony case called skull. Brain contains nerve cells called neurons which can interpret messages. Brain cells can also store information. It is connected to the rest of the body by the spinal cord.
  2. Spinal Cord: It is a thick long cable that runs down our backbone. It carries messages from the brain to the other parts of the body and vice versa. Spinal cord is also responsible for the reflex action which is a quick response given to stimuli without involving the brain.
  3. Nerves: Nerves are long wire-like structures connected to each other and made up of thin strands called neurons. They help in passing messages throughout the body.
Skeletal System
The Skeletal System is made up of bones that give support and shape to our body and protects the internal organs in our body.
  1. Skull: The hard bony skull in the head protects the brain.
  2. Rib Cage: The rib cage has 12 pairs of ribs in the chest that protect the lungs.
  3. Backbone: The backbone also called spinal or vertebral column contains 33 discs that run down the back. It is flexible enabling us to bend our backs and houses the spinal cord inside it.
  4. Other Bones: There are totally 206 bones in an adult's body.
  5. Joints: Joints are places where two or more bones join. They help us to move different parts of the body.
Related Links
Human Body for first and second graders
Human Body for third and fourth graders