Which of the following statements is false? (choose one)

a. voltage-gated sodium (na+) channels open in the dendrites and cell body during a local, graded potential.
b. during repolarization, potassium ions are leaving the cell (k+ is diffusing out of the cell), and the inside of the cell becomes more negative
c. if someone damaged an efferent motor neuron, they could feel pain, but not respond to move away from the pain
d. myelin serves as electrical insulation and increases the speed at which an action potential travels along the axon
e. movement of ions can be excitatory (if sodium ligand-gated channels bind the neurotransmitter), or inhibitory (if potassium ligand-gated channels bind the neurotransmitter)

What volume of a 0.25 m solution can be made using 0.55 moles of ca(oh)2

Which sequence correctly shows the path of carbon dioxide during repiration?

To answer this question, researchers studied populations of the dusky salamander (desmognathus ochrophaeus) living on different mountain ranges in the southern appalachian mountains. the researchers tested the reproductive isolation of pairs of salamander populations by leaving one male and one female together and later checking the females for the presence of sperm. four mating combinations were tested for each pair of populations (a and b)—two within the same population (female a with male a and female b with male b) and two between populations (female a with male b and female b with male a). the proportion of successful matings for each mating combination was measured. for example, when all the matings of a particular combination were successful, the researchers gave it a value of 1; when none of the matings were successful, they gave it a value of 0. then the researchers calculated an index of reproductive isolation that ranged from 0 (no isolation) to 2 (full isolation). the reproductive isolation value for two populations is the sum of the proportion of successful matings of each type within populations (aa + bb) minus the sum of the proportion of successful matings of each type between populations (ab + ba). the table provides data for the geographic distances and reproductive isolation values for 27 pairs of dusky salamander populations.