PNB 2250 Lecture Notes - Lecture 5: Partial Pressure, Lake Nyos, Paleozoic
10 Nov 2016
School
Department
Course
Professor
Document Summary
Respiration & physical factors of animals/environment: oxygen in, carbon dioxide out, oxygen delivery system, co2 loss. Respiratory proteins, etc: tied to cellular metabolism. Oxidative phosphorylation is the key process: all animals require oxygen; no exceptions, oxygen is inherently dangerous. Formation of oxygen derived free radicals. Well mixed about 21% diatomic oxygen. Geological changes: oxygen from non-detectable levels to 21, co2 has varied 10-fold, paleozoic era 35% oxygen, permian period hypoxia. Loss of 90% marine and 70% terrestrial animals. Microenvironments: deep ocean, freshwater lakes, swamps, caves, etc. In 1986, a large cloud of co2 killed 1700 people and 3500 livestock (suffocation) Deep limestone caves have more than 1% co2. Exoplanets: there are many earth-like planets in our galaxy. 3747 planets in 3571 systems: goldilocks zone. Rate of gas exchange is a direct determinant of physical activity. Animals act to increase gas exchange via physical/chemical/other means. Dissolved gas is proportional to partial pressure in gas phase.
