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:

Oviparous

Referring to organisms that lay eggs, with embryos developing and hatching outside the mother's body.

Amniotic Egg

An egg that contains amniotic fluid to protect and hydrate the embryo; a key adaptation for life on land found in reptiles, birds, and mammals.

Evolve

The sequence by which distinct living species are theorized to have evolved and expanded from prior versions across the earth's historical span.

Monotremes

A group of mammals that lay eggs instead of giving birth to live young, including the platypus and echidnas.