The nursing instructor is teaching a group of nursing students the correct assessment of normal heart sounds.Draw an arrow on the part of the stethoscope that should be used by the nursing student to auscultate normal heart sounds. 
Definitions:
Guanine
Guanine is one of the four main nucleobases found in the nucleic acids DNA and RNA, where it forms base pairs with cytosine.
Cytosine
One of the four main bases found in DNA and RNA, a pyrimidine nucleotide that pairs with guanine.
Nucleus
The central and most important part of an atom, containing protons and neutrons, or a membrane-bound organelle in cells containing the genetic material.
Chromosomes
Structures made of DNA and protein found in the nucleus of cells that carry genetic information from one generation to the next.
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