Select your answer:
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Composition of Blood and Blood Cells › View
This is a blood smear. What type of cell is indicated by the YELLOW arrow?
A. erythrocyte (RBC)
B. megakaryocyte
C. leukocyte (WBC)
D. thrombocyte (platelet)
Circulatory System › View
What function does the heart do?
A. Protects organs and produces red blood cells.
B. Generates heat.
C. Breaks down food into nutrients.
D. The heart is a pump, which moves the blood. The arteries and veins are the pipes where the blood flows.