HTHSCI 1H06 Lecture Notes - Lecture 12: Defecation, Sea Urchin, Lake Trout

• School: McMaster University
• Department: Health Sciences
• Course: HTHSCI 1H06
• Professor: Peter Helli

Document Summary

Part 1: thoracic cage & upper airways & part 2: lower airways: functions of the respiratory system. Perform gas exchange (obvious, getting rid of co2, bringing in oxygen) Regulate blood ph (as co2 levels rise ph drops) Provide for olfaction (smell due to sensory receptors in nasal mucosa, molecules get dissolved in mucosa and allow us to depict various scents) Provide for phonation (sound, just by the velocity of air which passes through your vocal cords larynx- or simply by breathing through mouth or nose: thoracic cage. Costal cartilage: notice that the ends of ribs are not completely ossified, this is to help stabilize the sternum. Suprasternal notch at the top, lies above the trachea, this is an alternative airway (tube can be inserted) Sternal angle, good region for auscultation of lung sounds. Features of the ribs (facets, demi-facets, costal angle, costal groove: facets: for articulation w/ vertebrae.