The Reticular Activating System of the Brainstem Is Continuously Active

question 201

Multiple Choice

The reticular activating system of the brainstem is continuously active while we are awake.Neurons in this region maintain the responsiveness of the brain by

• A) reducing the number of action potentials fired by brainstem neurons.
• B) decreasing the number of cycles of REM sleep.
• C) hyperpolarizing cortical neurons.
• D) firing action potentials in synchronized bursts.
• E) releasing neurotransmitters that maintain the sensitivity of neurons in the thalamus and cortex.

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Definitions:

Thrill

A sudden feeling of excitement and pleasure or, in a medical context, a vibration felt on palpation, indicative of an abnormal blood flow or heart murmur.

Pedal Pulses

The palpable beats felt over the foot's arteries, reflecting the circulation to the lower extremities.

Diminished

Reduced or lessened in size, importance, or intensity.

Crepitus

A crackling or popping sound or sensation experienced under the skin and joints or in the lungs, often indicating the presence of air in abnormal places or friction between bone and cartilage.