Shiri dzine imwe yenzira dzakaoma zvikuru dzokufema pamapoka ose emhuka. Pavanenge vachifema, 75% yemhepo yakachena inopfuura nemumapapu uye inoyerera yakananga muhomwe yemhepo yekumashure iyo inotambanuka kubva kumapapu uye inobatanidza nenzvimbo dzemuchadenga mumapfupa uye inozvizadza nemhepo. Imwe 25% yemhepo inoenda yakananga mumapapu. Shiri painobuda, mweya unoshandiswa unobuda mumapapu uye mweya mutsva wakachengetwa kubva muhomwe yemhepo yekumashure unomanikidzwa panguva imwe chete mumapapu. Nokudaro, mapapu eshiri anogamuchira kuwedzerwa kwakasimba kwemhepo yakachena panguva yekufema nekufema. Kugadzirwa kwezwi kunoitwa uchishandisa syrinx, kamuri yemhasuru inosanganisira matempani akawanda anoyerera kubva kumagumo ezasi e trachea; trachea iri kuwedzerwa mune dzimwe mhando, ichiwedzera huwandu hwekutaura uye kuona kweiyo huru mhepo bhegi yeshiri iyo inotambanuka kubva kumapapu uye inobatana nenzvimbo dzemhepo mumapfupa uye inozadza nemhepo.
bhegi remhepo riri kumashure