The Rapid Depolarization Phase of a Pacemaker Cell Action Potential

question 67

Multiple Choice

The rapid depolarization phase of a pacemaker cell action potential is caused by movement of

• A)calcium through T- type channels.
• B)sodium through funny channels.
• C)potassium through funny channels.
• D)calcium through L- type channels.
• E)sodium and calcium through funny channels.

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Definitions:

Corpus Striatum

Caudate nucleus, putamen, and globus pallidus; so-named because of the striations caused by intermixing of gray and white matter, which result from the number of tracts crossing the anterior portion of the corpus striatum.

Subthalamic

Pertaining to the location or region under or beneath the thalamus in the brain, often referring to the subthalamic nucleus involved in motor control.

Central Sulcus

A prominent landmark of the brain, separating the parietal lobe from the frontal lobe.

Frontal

Relating to the front part; in anatomy, it often refers to the frontal lobe of the brain, key in controlling important cognitive skills.