1.
What is the reason for lub-dub sound from the heart? – Quora
www.quora.com/What-is-the-reason-for-lub-dub-sound-from-the-heart?share=1
2. 
The heart sounds “lub” and “dup” result from – Brainly.com
brainly.com/question/8793229
3.
Lub Dup Sound Of Heart
www.games-t.com/lub-dup-sound-of-heart
4.
Карточки Ch. 11 The Cardiovascular system | Quizlet
quizlet.com/285528919/ch-11-the-cardiovascular-system-flash-cards/
5.
[Solved] What is the time gap between two heart sounds?
testbook.com/question-answer/what-is-the-time-gap-between-two-heart-sounds–5feddd38791970025ff28594
6.
Differentiate between lub and dup sound class 11 biology CBSE
www.vedantu.com/question-answer/differentiate-between-lub-and-dup-sound-class-11-biology-cbse-5ff1ba785b8ad240e5a63afa
7.
Cardiac Cycle – Events and Sound of Heartbeat – Earth’s Lab
www.earthslab.com/physiology/cardiac-cycle-events-sound-heartbeat/
8.
If the heart sound recording and the ECO recordings are…
www.toppr.com/ask/question/if-the-heart-sound-recording-and-the-eco-recordings-are-superimposed-then-the-first-heart/
9.
Cardiovascular Examination – Part three – Auscultation of the heart
www.nursingtimes.net/clinical-archive/cardiovascular-clinical-archive/cardiovascular-examination-part-three-auscultation-of-the-heart-28-08-2007/
10. 
Write three differences about Lubb and Dup heart sounds. – Brainly.in
brainly.in/question/26550501
11. 
Fourth Heart Sound – an overview | ScienceDirect Topics
www.sciencedirect.com/topics/medicine-and-dentistry/fourth-heart-sound
Conclusion
Guide above should be useful for The Heart Sounds “lub” And “dup” Result From ________..