Organs Of The Human Body The human body
Organs Of The Human Body The human body is like an amazing machine. There are lots of different parts that all work together, allowing us to move, eat and breath. Organs are spread all over our body and each of them has a very important job.
Organs Of The Human Body
The Eye Humans, like most animals, have two eyes, a small distance apart. This allows us to judge distances and the size of objects, more easily. Each eye sees a slightly different picture, our brain then uses both pictures and works out what we are looking at.
The Eye The Cornea protects our eye. It is the outer lens which controls and focuses light. Light reflects from objects and enters our eye through the Pupil – the black hole in the middle.
The Eye The Iris is a like a muscle, It expands (gets bigger) when we need more light and contracts (gets smaller) when we need less light to be able to see things. The iris is coloured. What colour are yours?
The Eye The Lens focuses the light that we see and projects an image onto our retina.
The Eye The retina has lots of tiny dots, called receptors, these change the image into signals that our brain can understand. The signal is carried to our brain through the Optic Nerve.
The Brain The brain is like a computer that sends and receives messages all round our body very quickly. When we feel, see, hear, smell or taste something, messages are sent to our brain. When we move or talk, our brain sends messages to our muscles. The brain needs oxygen from blood to work properly, 3, 500 pints of blood flow through the brain every day!
The Brain Our brain is inside our head and is protected by our skull and a thin layer of liquid.
The Brain The brain has two sides, which control different parts of our body.
The Brain The brain has two sides, which control different parts of our body. The left is the logical side.
The Brain The brain has two sides, which control different parts of our body. And the right is the creative side.
The Heart Our heart is inside our chest and has a very important job. It moves blood all around our body, which carries oxygen to the other organs. When we exercise, our body needs more oxygen, so the heart pumps blood more quickly. You can feel your heartbeat in your chest or on your wrists. How quickly is your heart beating now?
The Heart There are four chambers inside your heart.
The Heart When your heart contracts, it pumps blood to your lungs and also pumps blood to the rest of your body.
The Heart When your heart expands, blood comes back from your lungs, full of oxygen. Blood also comes back from the rest of your body.
The Heart The blood moving around your body is called Circulation. It is important to keep your heart healthy, so it can continue it's important job.
Teeth are a sensory organ that we use to chew food. When we are young, we have 20 milk teeth. As we grow older, these teeth fall out and are replaced with 32 adult teeth. How many milk teeth have you lost?
Teeth are covered with enamal, which is the strongest material in our body. We need to clean our teeth and see our dentist regularly, to keep them strong and healthy
Teeth At the front of our mouth, our teeth are long and sharp, this is so we can bite into food. At the back of our mouth, the teeth are more wide and flat, we use these teeth to chew our food.
Lungs We have two lungs inside our chest, one on either side of our heart. They are like two bags, that expand contract, to get oxygen into our blood. When we breathe in and out, We call this respiration.
Lungs When we inhale, or breathe in, our lungs get bigger and fill with air. This fresh air is full of oxygen, which sticks to our blood.
Lungs When we exhale, or breathe out, our lungs get smaller and the air comes out of our mouth and nose. The air that comes out contains carbon dioxide, which is a waste product from our blood.
Stomach Your stomach is a stretchy bag, inside your belly. After you have chewed and swallowed food, it moves to your stomach to be digested.
Stomach There is acid inside our stomach, that dissolves food and kills germs. Once the food has been digested, it turns into a thick liquid and moves to our intestines.
Liver The liver is a large organ, which is underneath your lungs. When you're an adult, your liver will be nearly as big as a football! Your liver does several jobs, like:
Liver It cleans your blood. The liver helps you by taking toxins (substances in the body that are actually like poisons) out of your blood. Why do you have toxins in your blood in the first place? Sometimes your body produces them as part of its normal function, like breaking down protein, a component in foods such as meat and nuts.
Liver It makes bile. During digestion, your body takes everything your body needs from the food you eat. Fat is one of the things the body gets from food. Bile, a digestive juice produced by the liver, helps the body absorb fat into the bloodstream.
Liver The liver also helps the body use carbohydrates, another important component in food. Carbohydrates are found in lots of foods, such as bread, fruit, and milk.
Liver The body breaks down most carbs into a type of sugar called glucose, which is the main source of fuel for our cells. Glucose stored in the liver is called glycogen. Glycogen is like your backup fuel. When the body needs a quick energy boost the liver breaks down glycogen and releases glucose into the bloodstream. .
Kidneys We have two kidneys and they are at the bottom of our back. They are each about the size of a mobile phone and the same shape as a kidney bean.
Kidneys The main job of the kidneys is to clean our blood. There about 1 million tiny filters inside the kidneys called Nephrons. These filter our blood about 400 times per day and take out any waste, that our body doesn't need.
Kidneys Our Kidneys also balance the amount of water that goes into our body when we drink, or comes out of our body when we pee. The kidneys communicate with the brain to tell us when we need to have a drink.
Skin is the largest organ we have! It covers our body and protects everything inside. Skin also allows us to feel things when we touch them.
Skin The outside layer of our skin is called the epidermis. It is waterproof and tough, which protects us from the enivronment. It also contains pigment, which causes the colour of our skin.
Skin The inside layer of our skin is called the dermis. This is thicker and more stretchy. In this layer we have, sweat glands, hair follicles, nerves and blood vessels.
Bowels The intestines are part of the digestive system. They are all coiled up to fit inside your abdomen. The small intestine is a tube about 6 metres long. It is greyish-purple in colour and is about 35 mm wide. The large intestine is much shorter, only about 1 metre long but it is called large because it is wider. It is a reddish brown colour.
Bowels After our food has been digested in the stomach, it moves to the small intestine and then the large intestine. The good nutrients from our food are absorbed into our body. Everything that our body does not need is waste and leaves the large intestine when we poop.
The End There are lots of different organs inside your body that all have a special and important job to do.
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