What happens during countercurrent exchange in fishes?
A) Gas exchange occurs as blood and water move in opposite directions across a respiratory surface.
B) Gas exchange occurs as blood and water move in the same direction across a respiratory surface.
C) Oxygen enters the blood by diffusion, and carbon dioxide exits the blood by active transport.
D) Oxygen enters the blood by active transport, and carbon dioxide exits the blood by diffusion.
E) Oxygen and carbon dioxide move in opposite directions across the respiratory surface by facilitated diffusion.
A
You might also like to view...
what antimicrobial physical agent is used to sterilize surgical tools in hospitals?
What will be an ideal response?
what is secreted by monocytes that attract neutrophils to the site of lipid A?
What will be an ideal response?
Many plants adapted to arid environments use the ________ photosynthetic pathway to fix CO2 during the night
Fill in the blank(s) with correct word
How does natural selection operate to cause change in a population?
a. the members of the population are equally able to survive environment change. b. the members of the population differ so that only some survive when the environment changes c. the members of the population cause environmental changes and adapt tothem. d. all the members of the population adapt to environmental changes.