Under Extreme Conditions,how Does Activity of the Periaqueductal Gray (PAG)help

question 215

Multiple Choice

Under extreme conditions,how does activity of the periaqueductal gray (PAG) help relieve pain?

• A)It suppresses the activity of the somatosensory cortex.
• B)It suppresses the activity of limbic structures such as the amygdala.
• C)It inhibits neural activity in the spinal cord that results in less pain signals to the brain.
• D)It causes endorphins to be released throughout the body.

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Definitions:

Synaptic Knob

The terminal button of a neuron that contains neurotransmitters and is involved in the transmission of signals to another neuron.

Receptor Sites

Three-dimensional proteins on the surface of the dendrites or certain cells of the muscles and glands, which are shaped to fit only certain neurotransmitters.

Resting Potential

The difference in electric charge between the inside and outside of a resting neuron's plasma membrane, critical for nerve impulse transmission.

Synapse

A synapse is the junction between two neurons or between a neuron and a muscle, where electrical or chemical signals are transmitted.