In a cyclic population
a. populations occasionally increase repidily and then crash to a more stable level.
b. populations increase and decrease in a regular predictable pattern.
c. population fluctuates slightly.
d. population sizes vary.

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.