BSCI 207 Lecture Notes - Lecture 1: Countercurrent Exchange, Partial Pressure, Organism

• School: University of Maryland
• Department: Biological Sciences Program
• Course: BSCI 207
• Professor: Leo Shapiro

Document Summary

They keep their feet very cold so that there"s not a lot of heat flowing out of their bodies. Organisms with a large surface area to volume ratio lose more heat than those with a small surface area to volume ratio. Countercurrent heat exchange: heat moves out of warm arterial blood and into cold venous blood. Warm blooded fish have what is called countercurrent gas exchange: blood exits the exchange surface area at a higher oxygen partial pressure when exchange is countercurrent. Organisms are governed by the same physical and chemical principles/constraints.