What Structures Make Up the Large Surface Area for Gas

Q6: In humans, the respiratory rate is primarily

Q7: All of the following are respiratory surfaces

Q8: Alveoli<br>A) are blind sacs that extend from

Q9: A layer of smooth muscle in the

Q10: What stimulates the respiratory center to increase

Q12: Which of these animals use gills to

Q13: What effect does smoking have on the

Q14: What happens during countercurrent exchange in fishes?<br>A)

Q15: What are spiracles?<br>A) Openings into the alveoli

Q16: An emergency room physician has withdrawn blood