★ Human Organ System Quiz
Blood is composed of red blood cells, white blood cells, platelets, and plasma. Which part helps our blood to clot?
A. Red blood cells
B. White blood cells
C. Platelets
D. Plasma
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The two organs that are a part of the Central Nervous system are what?
A. Spinal cord and brain
B. Brain and peripheral nerves
C. Cerebrum and the cerebellum
D. Brainstem and the cerebellum
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