When Two Action Potentials Arrive Simultaneously at Two Different Presynaptic

question 54

Multiple Choice

When two action potentials arrive simultaneously at two different presynaptic terminals that synapse with the same postsynaptic neuron,

• A) the direction of the action potential is reversed.
• B) temporal summation occurs.
• C) spatial summation occurs.
• D) hyperpolarization occurs.
• E) threshold is never reached.

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Definitions:

Tidal Volume (TV)

The volume of air inhaled or exhaled during a normal breath.

Maximal Exhalation

The act of expelling as much air as possible from the lungs, used to measure lung capacity and function.

Normal Breath

The typical process of inhaling and exhaling air in a healthy individual without any respiratory conditions.

Blood H+ Levels

The concentration of hydrogen ions in the blood, which determines blood pH and is crucial for maintaining acid-base balance in the body.