What term describes a grade 2 heart murmur?

A grade 2 heart murmur is characterized as being audible and can be heard with a conventional stethoscope. It is typically a low to moderately loud sound that is distinct but not overly strong, which differentiates it from grades that are louder or associated with additional features like a thrill. The term "audible" most accurately reflects that it is detectable upon auscultation and does not imply any further qualifiers such as volume or the presence of accompanying signs like a thrill.

The other options describe gradations of loudness and associated characteristics that do not apply to grade 2 murmurs. "Moderately loud" would imply a slightly higher intensity than what is typically associated with a grade 2 murmur, "loud with thrill" indicates a higher grade that may have significant clinical implications, and "very loud, with thrill" would refer to even more intense sounds that are clear indicators of potentially serious underlying cardiac conditions, falling outside the characteristics of grade 2 murmurs. Thus, the focus on the term "audible" captures the essential properties of a grade 2 murmur accurately.