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stethoscope an instrument that makes the sounds inside a body louder. Doctors and nurses listen to the heart with a stethoscope.
thorax the part of the body between the neck and the abdomen in humans and in animals with four limbs; chest. It contains the ribs, heart, and lungs. [1/2 definitions]
vein a small vessel that carries blood to the heart. [1/3 definitions]
ventricle either of the two lower compartments of the heart. Ventricles receive blood from the upper compartments, called atria, and pump it to the lungs and throughout the body.