Examlex
Which of the following substances is a hormone that maintains your blood glucose level within normal limits,while you're asleep and when you haven't eaten for awhile?
Alveoli
Tiny air sacs in the lungs where the exchange of oxygen and carbon dioxide takes place.
Countercurrent Exchange
A mechanism where fluids flow in opposite directions in adjacent channels, maximizing transfer rates of heat, gases, or other substances.
Concurrent Exchange
A process where two substances in close proximity exchange properties or substances simultaneously, often used in reference to heat or gas exchange in biological systems.
Crosscurrent Exchange
A mechanism of exchange (often of gases or fluids) in opposite or perpendicular directions, enhancing the efficiency of transfer.
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