Choose the correct answer to complete the paragraph about the acceptance of the heliocentric model.
in the second century bce, the greek astronomer ptolemy tried to explain the backward movement of the planets
by using a solar system model that included
. for centuries, this was the accepted model. during
the renaissance, nicholas
discovered the old heliocentric model of aristarchus. in aristarchus's
model, the rising and setting of the sun was explained by the movement of the

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.