The _________ is part of our circulatory system.
The heart is part of our circulatory system.
The blood vessels are part of our ____________ system.
The blood vessels are part of our circulatory system.
The _________ is part of our excretory system.
The bladder is part of our excretory system.
The ureters are part of our __________ system.
The ureters are part of our excretory system.
The kidneys are part of our __________ system.
The kidneys are part of our excretory system.
The __________ is part of our excretory system.
The urethra is part of our excretory system.
The trachea is part of our ___________ system.
The trachea is part of our respiratory system.
The _________ are part of our respiratory system.
The lungs are part of our respiratory system.
The teeth are part of our ____________ system.
The teeth are part of our digestive system.
The _________ is part of our digestive system.
The esophagus is part of our digestive system.
The stomach is part of our ___________ system.
The stomach is part of our digestive system.
The _________ is part of our digestive system.
The intestine is part of our digestive system.
