Multiple choice

What is systole?

  1. The contraction of heart

  2. The expansion of heart

  3. The nodes containing lymphocytes

  4. The circulation of extracellular fluid in human body

  5. The rhythmic contraction and relaxation of heart muscles

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This is correct as the phase of heart when it contracts and pumps blood into veins is called systole.