Lesson: Chapter 6 — Human body processes

Heartbeat, blood pressure and lymph 2 of 5 Reset answers

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Question 2

What makes the lub-dub sounds of the heart?

A Blood hitting the ribs B The diaphragm moving C The valves closing D The lungs filling

The right answer is the one marked above.

The valves closing. First the valves between atria and ventricles, then those at the arteries.

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