★ Human Organ System Quiz
Where is the first place in the heart that blood flows through?
A. Superior and inferior vena cava
B. Pulmonary artery
C. Tricuspid valve
D. Left atrium
Preview next quiz:
I am flat, but blow up like a balloon when I’m filled up with urine. I push urine to the urethra so it can flow out. Who am I?
A. Kidneys
B. Ureter
C. Urinary bladder
D. Rectum
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