Body Organs Diagram
Where exactly is your liver, and what does the pancreas do? This interactive diagram shows the major internal organs from the front, in their approximate positions. Click any organ to see what it does, switch off the labels to test yourself, try the “spot the organ” and function quizzes, and print a labeled or blank copy for revision.
Interactive body organs diagram
Human Body Worksheet Pack
Printable human body worksheets with answer keys: labeled and blank organ diagrams, an organ systems sorting sheet, a digestion sequencing activity and a 12-question quiz.
- Labeled diagram (PDF)
- Blank diagram (PDF)
- Digestion sequence (PDF, DOCX)
- 12-question quiz (PDF, DOCX)
Formats: PDF, DOCX. Instant download after payment (link valid 72 hours, up to 5 downloads). AI-assisted: the templates were drafted with AI help and reviewed and laid out by Kedop.
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The main internal organs
| Organ | What it does |
|---|---|
| Brain | Controls thought, memory, emotion, movement and the senses; protected by the skull. |
| Oesophagus | The muscular tube that carries food and drink from the throat to the stomach by waves of muscle contraction. |
| Lungs | Two spongy organs in the chest that take in oxygen and remove carbon dioxide. |
| Heart | A muscular pump, slightly left of centre, that pushes blood around the body about 60–100 times a minute at rest. |
| Diaphragm | The dome-shaped muscle under the lungs that drives breathing. |
| Liver | The largest internal organ: it processes nutrients, stores energy, makes bile and breaks down toxins and medicines. |
| Gallbladder | A small pouch under the liver that stores bile and releases it to help digest fats. |
| Stomach | A J-shaped muscular bag that churns food with acid and enzymes before passing it on. |
| Spleen | An organ on the upper left that filters blood, recycles old red blood cells and helps fight infection. |
| Pancreas | Makes digestive enzymes and the hormones insulin and glucagon that control blood sugar. |
| Kidneys | Two bean-shaped organs at the back that filter blood to make urine and balance water and salts. |
| Small intestine | About 6 metres of coiled tube where most digestion and absorption of nutrients happens. |
| Large intestine | The wider tube framing the abdomen that absorbs water and forms stools. |
| Appendix | A small pouch off the large intestine, lower right; it can become inflamed (appendicitis). |
| Bladder | A stretchy bag low in the pelvis that stores urine until you go to the toilet. |
Where the organs are
The body is often described in regions. The chest (thorax) holds the heart and lungs, protected by the ribs and separated from the abdomen by the diaphragm. The upper right of the abdomen holds the liver and gallbladder; the upper left the stomach and spleen, with the pancreas tucked behind the stomach. The kidneys sit at the back on either side of the spine, partly protected by the lower ribs. The small intestine coils in the middle, framed by the large intestine, and the bladder sits low in the pelvis. Remember that “right” and “left” mean the person’s own right and left — so in a front-view diagram the liver appears on your left.
Organ systems
| System | Main organs | Job |
|---|---|---|
| Nervous | Brain, spinal cord, nerves | Control and communication |
| Respiratory | Lungs, airways, diaphragm | Gas exchange |
| Circulatory | Heart, blood vessels | Transport of blood |
| Digestive | Oesophagus, stomach, intestines, liver, pancreas, gallbladder | Breaking down food and absorbing nutrients |
| Urinary | Kidneys, ureters, bladder | Removing waste and balancing fluids |
| Immune / lymphatic | Spleen, lymph nodes | Fighting infection |
How to use the interactive diagram
- Start in Labeled mode and click each organ to read its job.
- Switch to Numbered mode to hide the names and test yourself, or print it as a worksheet.
- Try “Spot the organ”: one organ is highlighted and you pick its name.
- The function quiz describes an organ and asks you to choose it.
The kidneys are drawn with dashed outlines because they lie behind the other abdominal organs.
Worked example: following a meal
A sandwich travels down the oesophagus to the stomach, where acid and enzymes break it down over a few hours. In the small intestine, bile from the liver (stored in the gallbladder) helps digest fats and enzymes from the pancreas break down proteins, fats and carbohydrates; nutrients pass into the blood through the intestinal wall. The liver processes those nutrients, and the pancreas releases insulin to manage the rise in blood sugar. The large intestine absorbs water from what remains, and the kidneys filter waste from the blood into the bladder.
Largest and heaviest organs
The skin is the body’s largest organ overall. Inside the body, the liver is the largest solid organ, weighing about 1.5 kg in an adult, and the brain weighs roughly 1.3–1.4 kg. The small intestine is the longest, at around 6 metres, although it is much shorter while muscle tone keeps it contracted in a living person.
Organs you can live without
Some organs can be removed when they are diseased. People commonly live normal lives without the appendix or gallbladder, with only one kidney, or after the spleen is removed (though they may need extra vaccinations against some infections). Part of the liver can be removed and it can regrow a large part of its size. Organs such as the heart, brain and at least one lung, by contrast, are essential.
A note on the diagram
This is a simplified front view, not to scale, and organs overlap more than shown. Many structures — blood vessels, lymph nodes, reproductive organs, adrenal glands and the thyroid — are left out for clarity. For medical questions or symptoms, speak to a doctor.
Memory tips
- The heart is only slightly left of centre — most of it lies behind the breastbone.
- Liver on the right, stomach and spleen on the left.
- Kidneys are at the back, around waist height.
- The appendix is at the lower right — where appendicitis pain usually settles.
- The diaphragm is the dividing line between chest and abdomen.
Frequently asked questions
What are the main organs of the body?
Brain, heart, lungs, liver, stomach, pancreas, kidneys, intestines, spleen and bladder, among others.
Which side is the liver on?
The right side of the body, under the ribs.
Where are the kidneys?
At the back of the abdomen, either side of the spine around waist height.
What is the largest internal organ?
The liver.
What does the pancreas do?
It makes digestive enzymes and hormones such as insulin.
Which side is the appendix on?
The lower right side of the abdomen.
Can I print a blank diagram?
Yes, choose Numbered mode and print.