What is this?
This is vein.
What is this?
This is artery.
What is this?
This is heart.
What is this?
This is capillary.
What is the name of this system?
This is circulatory system.
What is the name of this system?
This is urinary system.
What is this?
This is kidney.
What is this?
This is ureter.
What is this?
This is bladder.
What is this?
This is urethra.
