During inhalation,_____muscles contract to elevate the ribs.During forced exhalation,______muscles contract to depress the ribs.
A)external intercostals;internal intercostals
B)transverse abdominis;diaphragm
C)diaphragm ;transverse abdominis
D)internal intercostals;external intercostals
E)rectus abdominis;external obliques

Question

Quizplus · Accepted Answer

During inhalation, the external intercostal muscles contract to elevate the ribs, increasing the volume of the thoracic cavity and allowing air to enter the lungs. During forced exhalation, the internal intercostal muscles contract to depress the ribs, decreasing the volume of the thoracic cavity and helping to expel air from the lungs. Therefore, option A is the best choice.

During Inhalation,_____muscles Contract to Elevate the Ribs