what are 2 factors that contribute to the efficiency of gas exchange in fish gills and why are they the most efficient respiratory organ?

Perch, Frog and Pig. 1.  Why do these organisms require a specialized organ to increase surface area for gas exchange?  Discuss organismal volume relative to surface area in your answer. 2.  Why are these respiratory structures associated with a large blood supply?

1. How is 20-30% of CO2 is transported in the blood? 2. How is 70% of CO2 transported in the blood? 3. What is the group in the medulla that initiates inspiration?

What are 3 physical conditions that can optimize the rate of diffusion of a gas across a membrane (contained in Fick’s Law)?

Where are exchange epithelial cells found? What did the alveoli look like on the slide, and why is their structure important? Do these cells have tight junctions? Explain why.