Lecture 3 | Neuronal Cell Biology | Silk

Soma

cell body, contains the nucleus and other organelles

axon

where action potential is perpetuated

synapse

terminal region of the axon

dendrite

specialized extension that receives incoming signals from other neurons

Myelin

specialized insulating sheath

what creates myelin in the CNS?

oligodendrocytes

what creates myelin in the PNS?

schwann cells

1. Soma

2. Dendrite

3. axon

4. myelin sheath

5. ?

   1. Terminal Button

Passive Transport

the movement down a concentration gradient that does not require energy

Is there more potassium ions in the cell or outside the cell at rest?

Inside the cell

(banana on the inside, ocean water on the outside)

Na+ ions come INTO the cell during the rising phase

Depolarization

the rapid influx of positively charged ions, primarily sodium ions

repolarization (falling phase)

closure of the sodium channels and opening of potassium channels. K+ flows INTO the cell

MOA of novocain

blocks voltage-gated sodium channels so that action potential is not propagated

Electrical synapses are _____

FAST

which type of synapse is more common?

chemical synapses

Metabotropic receptors act more _____, and response last _____

slowly, longer

metabotropic receptors are also known as _____

G-protein coupled receptors