Question

The point of maximal impulse (PMI) is located at __________________.

1) the 1st or 2nd intercostal space
2) the 2nd or 3rd intercostal space
3) the 3rd or 4th intercostal space
4) the 4th or 5th intercostal space

Answer 1

The point of maximal impulse is located at the 4th or 5th intercostal space. Intercostal muscles assist in breathing by changing the rib cage dimensions, which is related to the PMI's anatomical position.

Step-by-step explanation:

The point of maximal impulse (PMI) is located at the 4th or 5th intercostal space. The PMI can usually be felt at the apex of the heart, which lies on the left side of the body, at the midclavicular line, in the 4th or 5th intercostal space.

Intercostal muscles play a vital role in the respiratory system. They consist of three sets of muscles that help in breathing by altering the dimensions of the rib cage. Understanding the location and function of intercostal muscles is essential for comprehending the PMI's placement and the mechanics of respiration.