BIOL 1344 Lecture 6: Chapter 23: Respiratory System Part 1
26 Jul 2018
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Quiet breathing: using diaphragm and ribcage muscles; normal breathing. At the same time, external intercostals contract and raise the ribcage. Expiration: passive (don"t have to do anything to diaphragm); diaphragm relaxes. Forced breathing: using muscles of neck and abdominal; forcing air in and out. Inspiration: using sternocleidonastroid, scalenes (in neck), pectoralis minor, erector spinae, and serratinus posterior superior. Expiration: using internal intercostals, pectus abdominis, serratus posterior inferior (side of ribcage), external oblique (in abdominal wall), and transversus thoracis. Spirometry: is how much air goes in and out of the lungs with each breath (tidal. Inspiratory reserve volume: air inhaled at the end of normal respiration (irv) ---> Expiratory reserve volume: air exhaled at the end of normal respirataion (erv) --- Residual volume: how much air is always present in the lungs; lungs are never out of air or collapsed (rv) ---> 1200ml. Forced expiratory volume 1 (fev1): air expelled out of lungs in first one second.
