Heart
CorA muscular organ that pumps blood throughout the body, delivering oxygen and nutrients to every cell.
- Size
- About the size of your fist
- Weight
- 250–350 g
- Location
- Behind the sternum, slightly left
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Human body atlas
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Open reference →Organ reference cards
Brain
EncephalonThe body’s command center, integrating sensation, memory, emotion, and precise movement.
- Size
- Roughly two clenched fists
- Weight
- 1.3–1.4 kg
- Location
- Protected within the skull
Lungs
PulmonesPaired organs that draw in air and trade oxygen for carbon dioxide across a vast, delicate surface.
- Size
- Each about 25 cm tall
- Weight
- About 1 kg for the pair
- Location
- Either side of the heart, within the ribcage
Liver
HeparA remarkable metabolic organ that filters blood, processes nutrients, and produces bile.
- Size
- About the size of a football
- Weight
- 1.4–1.6 kg
- Location
- Upper right abdomen
Kidneys
RenesPaired filtration organs that balance fluids, electrolytes, blood pressure, and waste removal.
- Size
- Each is about a computer mouse
- Weight
- 120–170 g each
- Location
- Either side of the spine below the ribs
Eye
OculusA precision sensory organ that converts focused light into neural signals interpreted as vision.
- Size
- About 24 mm across
- Weight
- Around 7.5 g
- Location
- Within the bony orbit
Intestine
IntestinumA folded digestive passage where nutrients are absorbed and the microbiome supports whole-body health.
- Size
- About 6–7 m when extended
- Weight
- Varies with contents
- Location
- Central and lower abdomen
Pancreas
PancreasA dual-purpose gland that releases digestive enzymes into the gut and the hormones that steady blood sugar.
- Size
- About 15 cm long
- Weight
- 70–100 g
- Location
- Behind the stomach, across the upper abdomen
Skin
IntegumentumThe body’s largest organ — a living barrier that senses touch, holds in water, and regulates temperature.
- Size
- About 2 m² spread flat
- Weight
- 3.5–5 kg
- Location
- Covering the entire body