What anatomical structure of the heart produces the "lub" and "dub" sounds? what are korotkoff sounds? how are korotkoff sounds different from the "lub" "dub" sounds?  

Which training principle states that exercising a certain body part are practicing a particular skill primarily develops that part or skill

Describe the purpose and function of recording the start and stop time for anesthesia services.

Which of the following processes within viral replication is the greatest source of genetic variation in rna virus populations? a) high mutation rate due to lack of proofreading of rna genome replication errors. b) transcription from the host cell rna polymerase introduces numerous mutations. c) capsid proteins from the host cell can replace the viral capsid. d) viral rna is translated by host cell ribosomes.