BSC 2011 Lecture Notes - Lecture 15: Hemocyanin, Exhalation, Thoracic Cavity

• School: University of Florida
• Department: Biology - Biological Sciences
• Course: BSC 2011
• Professor: Norman Douglas, Nicole Gerlach, Todd Palmer

Document Summary

Separate flows: good for maximizing heat loss via the extremities, example) heat loss through the ears of a rabbit to get back to the basal metabolic rate/temperature. Respiratory gas exchange depends on diffusion and bulk flow. Cellular respiration: food + o2 atp + co2 + h2o + heat. Gas exchange: the uptake of o2 from the environment, the discharge of co2to the environment. Gas exchange involves two processes: ventilation movement of the respiratory medium (air or water) past the gas exchange medium, perfusion the blood coming into contact with the gas exchange medium to acquire the oxygen. Lungs: gases must diffuse across gas exchange membranes and into/out of cells along its concentration gradient. Measured as partial pressures: fi(cid:272)k"s law of diffusio(cid:374) A = cross sectional area of respiratory membrane. P1 p2 = difference in the partial pressures of the gas on either side of the membrane. L= the distance of diffusion across the membrane.