Which respiratory surface lacks physical protection from the external environment?
A) tracheal system tubes
B) human lungs
C) external gills
D) internal gills
E) bird lungs
Correct Answer:
Verified
Q2: Why is proper ventilation important for a
Q3: As elevation increases, O2_.
A) availability increases
B) availability
Q4: In aquatic animals, the most disadvantaged in
Q5: Amphibians often use _ as a respiratory
Q6: Choose the correct order of tracheal system
Q7: O2is transported from air in the lungs
Q8: The _ cells are most sensitive to
Q9: Why does countercurrent exchange optimize gas exchange
Q10: Water is an optimal respiratory medium because
Q11: In humans, _ is involved in both
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