The Heart The heart is essential for your survival! Your heart is constantly working, even when you are resting. The heart, blood and blood vessels together make up the circulatory system. The heart pumps the blood through the blood vessels to all the different tissues of the body. This blood carries water, oxygen and nutrients. B loodis also important for removing waste products from the body. The heart sits between the lungs in the chest, where it is well-protected by the rib cage.
The lungs Your lungs make up one of the largest organs in your body, and they work with your respiratory system to allow you to take in fresh air, get rid of stale air, and even talk. Let's take a tour of the lungs
The liver • Your liver is the largest solid organ in your body. By the time you're grown up, it will be about the size of a football. The liver does many jobs, but here are three big ones:
The eyes • You can check out different parts of the eye by looking at your own eye in the mirror or by looking at (but not touching) a friend's eye. Some of the eye's parts are easy to see, so most friends will say OK. Most friends won't say OK if you ask to see their liver
The brain The human brain is like a powerful computer that stores our memory and controls how we as humans think and react. It has evolved over time and features some incredibly intricate parts that scientists still struggle to understand. The brain is the centre of the human nervous system, controlling our thoughts, movements, memories and decisions. With evolution, the human brain has become more and more complicated, many of its interesting properties are still not well understood by scientists. The brain contains billions of nerve cells that send and receive information around the body
The stomach • The human stomach is roughly J-shaped and is located in the upper left side of the abdomen. The stomach of an adult is about 10 inches (25 centimeters) long and can easily expand to hold about a quart (a liter) of food.
The kidney • Kidneys normally come in pairs. If you've ever seen a kidney bean, then you have a pretty good idea what the kidneys look like. Each kidney is about 5 inches (about 13 centimeters) long and about 3 inches (about 8 centimeters) wide — about the size of a computer mouse.