BIOLOGY 2A03 Lecture Notes - Lecture 42: Bronchus, Peptide, Pulmonary Stretch Receptors
21 Apr 2016
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Two interpretations of respiration: external respiration: gas exchange o2 movement from environment to cell (mitochondria) and movement of co2 in. Internal respiration: cellular respiration metabolism in cells. e. g. c6h12o6 +6 h2o+ 6o2 -> 12h2o + 6co2 + 38 atp. Warms air to 37 degrees, and humidifies it to 100% relative humidity. 1. conducting zone: reinforced epithelium creates mucus, sweeps it upwards(mucus elevator); macrophages ingest particles (cleanses air) Hydrogen bonding between water molecules causes surface tension, which reduces water surface area (e. g. , makes droplets become more spherical) The fluid lining alveoli create an inward pressure that tends to cause alveolar collapse. Force causing alveoli to collapse is equal to surface tension (p=2t/r: the tendency/force to collapse is greater for smaller alveoli (when number is small, t= surface tension r = alveoli"s radius. Respiratory distress syndrome (rds) in pre-mature babies is due to inadequate surfactant.
