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(The digestive system, The circulatory system, The excretory system, The…
The digestive system
The Oesophagus
The stomach
The mouth
The intestines
The circulatory system
Blood vessels
Circulation
Blood
The heart
The excretory system
Dialysis and transplants
Sweat glands
The urinary system
The respiratory system
Breathing in and out
Respiration
