1) Which blood vessels have the smallest diameter? a) Arterioles b) Capillaries c) Venules d) Lymphatic 2) What is the longest bone? a) Femur b) Tibia c) Fibula d) Patella (or kneecap) 3) What is the most important organ? a) stomach b) heart c) liver d) brain 4) What are leukocytes called? a) Red cells b) white cells c) bones d) phalanges 5) How many teeth does an adult have? a) 32 b) 33 c) 34 d) 29 6) Whose heart beats faster? a) of children b) Men's c) of women d) as 7) How many chambers does the heart have? a) 3 b) 4 c) 5 d) 6 8) What is the smallest bone? a) shoulder blade b) clavicle c) ribs d) ladder

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