Multiple choice

The circulatory system consists of heart, blood and ________.

  1. lungs

  2. bone

  3. blood vessels

  4. ribcage
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Blood vessels are the correct answer. The circulatory system comprises three main components: the heart (pump), blood (transport medium), and blood vessels (the network of tubes). Lungs, bones, and ribcage are parts of other body systems (respiratory, skeletal).

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