lub dub
Lubb dubb corresponds to the heart sounds heard during systole and diastole, respectively.
HCA? I believe it's "lub" and "dup". (p. 493, under "heart sounds" heading...second sentence)
Heart sounds are noises generated by the beating heart from the flow of blood through it. Thump, boom can be used to describe it. Lub and Dub are also used. There are other sound words that suggest problems with the hearbeat as well.
Onomatopoeia
Sounds as if you are describing graphite.
The word is spelled onomatopoeia. An onomatopoeia is a word that sounds like what it is describing. A good example of this is the word quack. The sound that a duck makes is "Quack." The word sounds like the sound it is describing.
Heart sounds are created primarily from turbulence in blood flow created by the closures of the valves.
what are fetal heart
Understanding Pediatric Heart Sounds was created in 2003.
Two sounds
There are 5 syllables. Mon-o-syll-a-bles.