Spatial Summation Refers to

question 20

Multiple Choice

Spatial summation refers to

• A) electrical signals reaching neurons from outer space.
• B) multiple graded potentials arriving at one location simultaneously.
• C) repeated graded potentials reaching the trigger zone one after the other.
• D) suprathreshold potentials triggering action potentials that are extra large.
• E) All of the answers are correct.

---

Definitions:

Vagus Nerve

The tenth cranial nerve, extending from the brainstem to the abdomen, which influences various functions including heart rate, gastrointestinal peristalsis, and sweating.

Vestibulocochlear Nerve

A cranial nerve that transmits sound and equilibrium (balance) information from the inner ear to the brain.

Merkel Disks

Specialized skin cells that function as mechanoreceptors, responding to light touch and pressure.

Mechanoreceptors

Sensory receptors that respond to mechanical pressure or distortion.