1. in quiet breathing,
(a) inspiration and expiration involve muscular contractions
(b) inspiration is passive and expiration involves muscular contractions
(c) inspiration involves muscular contractions and expiration is passive
(d) inspiration and expiration are both passive processes
(e) none of the answers are correct
2. when the diaphragm and external intercostal muscles contract;
(a) expiration occurs
(b) intrapulmonary pressure increases
(c) intrapleural pressure decreases
(d) the volume of the lungs decreases
(e) all of the answers are correct