Теория:

To speak about internal organs, you need the appropriate vocabulary.
  
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Stomach - the organ inside your body where food goes after it has been eaten and where it starts to be digested;

Lung - one of the two organs inside your chest that are used for breathing;

Brain - the organ inside your head that controls your thoughts, feelings, and movements;
 
Tissue - the material that animals and plants are made of;

Spine, backbone, spinal column - the long structure of bones down the centre of your back, which supports your body;

Kidney - one of the two organs in your body which remove waste from the blood and produce urine;

Heart - the organ inside your chest that sends blood around your body;

Skeleton - the structure made of all the bones in the body of a person or animal;

Skull - the part of your head that is made of bone and which protects your brain.
 
Examples:
  
Some people can have problems with their lungs because of smoking.

She will have an operation on the heart.

Fast food destroys your stomach.
Источники:
web.iit.edu