Problem: Determine which muscles are contracted with each of the respiratory volumes and capacities below. Labels Drop Zones Reset All Serratus anterior, pectoralis minor, Vital Capacity (1/3) Expiratory Reserve Tidal Volume (3/3) and internal Volume (2/3) obliques Internal and external intercostals Diaphragm only Diaphragm and rectus abdominis Internal intercostals and sternocleidomastoid Internal obliques and internal intercostals Internal intercostals. Need Assignment Help?