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1. Trace a breath
• Nose• Pharynx- throat• Larynx- voice box• Trachea- windpipe• 2 Bronchi• 2 Lungs• Alveoli
• Inspiration- Active phase, lungs expand
• Expiration- passive phase, lungs relax
• Diaphragm- horizontal muscle of breathing, under lungs
3.Ventilation- breathing, air drawn in and out
4&5. Gas exchange in Lungs and Tissue
• External respiration- exchange of gasses in the lungs. Blood gives off CO2 and picks up O2.
• Internal respiration- exchange of gasses between blood and cells. Blood gives off O2 to the cells and picks up CO2
• O2 is carried in hemoglobin of RBC
• Co2 is carried in Plasma as Bicarbonate ion
6. Regulation of Respiratory Rates
• Adults- 12-20/ minute
• Child- 20 and up/ minute
Breathing is rhythmic, involuntary and is regulated by the respiratory center in the Brain Stem.