ICSE Class X Biology 2017 Solved Papers

The diagram given below represents a section of the human heart. Answer the questions that follow:

Question : 79 of 101

Marks: +1, -0

What causes the heart sounds 'LUBB' and 'DUP'?

Solution:

LUBB - Lubb sound is produced due to partial closure of bicuspid and tricuspid valves (auriculo-ventricular values).
DUP - Sound is caused when the two semilunar values shut.

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