Physioex 9.0 Exercise 3 Pre & Post-Lab Activity 1

Pre-Lab
Part A
Which of the following statements about receptor potentials is FALSE?
    They can trigger an action potential.
    The receptor proteins respond to stimuli.
    The receptor potential is carried by neuroglia.
    Odor molecules can act as stimuli.

Part B
Which of the following is NOT a functional region of a neuron?
    receiving region
    secretory region
    medullary region
    conducting region

Part C
The conducting region of the neuron is the _______.
    axon terminal
    cell body
    dendrite
    axon

Part D
The typical concentration of sodium is _______.
    lower than potassium intracellularly.
    lower than potassium extracellularly.
    higher than potassium intracellularly.
    the same as potassium intracellularly.

Part E
Which of the following describes a change from the resting membrane potential?
    a receptor potential, a synaptic potential or an action potential
    a receptor potential
    a synaptic potential
    an action potential

Post Lab
Part A
What effect did increasing the extracellular potassium have on the resting membrane potential?
What effect did increasing the extracellular potassium have on the resting membrane potential?
    The resting membrane potential became less negative.
    The resting membrane potential became more negative.
    The resting membrane potential disappeared.
    The resting membrane potential did not change.

What effect did decreasing the extracellular sodium have on the resting membrane potential?
What effect did decreasing the extracellular sodium have on the resting membrane potential?
    The resting membrane potential disappeared.
    The resting membrane potential became less negative.
    Only a small change occurred, because the resting neuron is not very permeable to sodium.
    Only a small change occurred, because the sodium channels were mostly open.

The channels that provide for the movement of potassium in the resting neuron are _______.
The channels that provide for the movement of potassium in the resting neuron are _______.
    leakage and chemically gated.
    voltage gated
    leakage
    chemically gated

Establishing the resting membrane potential requires energy through the use of the _______.
Establishing the resting membrane potential requires energy through the use of the _______.
    sodium leakage channels
    sodium-glucose pump
    potassium-glucose pump
    sodium-potassium pump