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countercurrent exchange mechanism
The phenomenon that increases the gas exchange efficiency of fish gills
After an action potential, resting potential restored
by the opening of voltage-sensitive potassium channels and the closing of sodium activation gate
part of the vertebrate nervous system is most involved in preparation for the "fight-or-flight" response
telencephalon region of the brain
It is the brain region most like that of ancestral vertebrates, develops as the neural tube differentiates, develops from the midbrain, and divides further into the metencephalon and myelencephalon.
Specialized regions are possible
advantage of a complete digestive system over a gastrovascular cavity
Cows are able to survive on a diet consisting almost entirely of cellulose due to
cellulose-digesting, symbiotic microorganisms in their rumens
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