World Book Trivia Quiz For Kids--10/15--human Body

The digestive system is made up of various organs. It allows the body to digest, or use, food. Digestion begins in the mouth as food is chewed. After it is swallowed, the food passes through a tube called the esophagus and enters the stomach.

Human beings cannot live without oxygen. The oxygen enters the bloodstream and is carried throughout the body. The lungs also remove carbon dioxide from the blood. Carbon dioxide is a gas that is produced by the body as a waste.

A human skeleton has about 206 bones. Sixty bones are in the hands and arms alone.

Blood has two parts: a liquid called plasma and the blood cells that move around in it.

The skin is the largest organ of the body.

The urinary system removes wastes from the blood and flushes them out of the body. The chief organs in this system are the two kidneys. Blood flows through the kidneys, and wastes are filtered out.

A funny bone is not a bone at all, and it's not funny either. It is an area at the end of your elbow that can be hurt easily. The ulnar nerve lies in this area between the skin and the bone.
The ulnar nerve has no bone or muscle to protect it. So even the smallest blow to this area strikes this nerve and causes a sharp pain and a tingling feeling.

Water makes up about 65 percent of the body.

The brain is a jellylike ball, protected by the hard bony case of the skull. It is made of billions of cells called neurons. These cells send messages in the form of tiny electrical signals to other body cells through pathways called nerves. The signals travel at up to 200 miles (322 kilometers) an hour.

Groups of organs form organ systems. Each organ system carries out an important activity in the body. The body has 10 organ systems. They are the: skin; skeletal system; muscular system; digestive system; respiratory system; circulatory system; urinary system; reproductive system; endocrine system; and nervous system.