What is the purpose of the bones in the middle ear? They protect the cochlea from intense sound.
They send electrical impulses to the brain.
They amplify the motion of the eardrum.
They block unnecessary noise.

Define the apical impulse and describe its normal location, size, and duration. which abnormal conditions may affect the location of the apical impulse? explain the mechanism producing normal first and second heart sounds. describe the effect of respiration on the heart sounds. describe the characteristics of the first heart sound and its intensity at the apex of the heart and at the base. describe the characteristics of the second heart sound and its intensity at the apex of the heart and at the base.