Graphs, Brain and other Stuff BIOL 1103

Resting (1)

Voltage-gated Na⁺ & K⁺ channels closed; Na⁺/K⁺ pump active.

Depolarization(2)

Voltage-gated Na⁺ channels open → Na⁺ influx.

Repolarization(3)

Na⁺ channels inactivate; voltage-gated K⁺ channels open → K⁺ efflux.

Hyperpolarization(4)

K⁺ channels remain open slightly longer; membrane dips below rest.

Return to Rest (5)

K⁺ channels close; pump restores gradients.

neurotransmitters tend to generate depolarizing graded potentials, while

Excitatory 

neurotransmitters tend to generate hyperpolarizing graded potentials.

Inhibitory

Myelin in the CNS is produced?

oligodendrocytes Cells

Myelin in the PNS is produced?

Schwann Cells

. In the CNS, clusters of neuron cell bodies are in?

the gray matter

Bundle of axons FORM (in the CNS)

tracts(white matter)

in the PNS, cell body clusters are

ganglia

bundle of axons are called?

nerves