click below
click below
Normal Size Small Size show me how
Physiology week 7
| Whether an impulse is continued through the neuron depends on the magnitude of the voltage in the axon hillock. | True |
| Movement of the membrane potential away from zero (below the usual RMP) is called | hyperpolarization |
| An ion channel that opens in response to a sensory stimulus is a(n) | stimulus-gated channel |
| The tiny bulge at the end of a terminal branch of a presynaptic neuron’s axon is called a(n) | synaptic knob |
| There are two types of synapses—the electrical synapse and the __________ synapse | chemical |
| In depolarization the membrane potential moves toward zero, whereas in hyperpolarization the membrane potential moves away from zero. | True |
| A synapse can occur only between an axon and: | another axon, cell body, dendrite. |
| The difference between sodium and potassium in the generation of action potential is that: | sodium causes depolarization of the cell membrane, and potassium causes repolarization of the cell membrane. |
| The active transport mechanism in the plasma membrane that transports sodium and potassium ions in opposite directions and at different rates is the | sodium-potassium pump |
| Which chemicals allow neurons to communicate with one another | neurotransmitters |