Once an SA Nodal Cell Reaches Threshold, the Depolarization Phase

question 115

Multiple Choice

Once an SA nodal cell reaches threshold, the depolarization phase occurs during which

• A) potassium comes in through fast voltage-gated channels.
• B) calcium comes in through fast voltage-gated channels.
• C) potassium moves out through fast voltage-gated channels.
• D) sodium moves out through slow voltage-gated channels.
• E) calcium moves out through slow voltage-gated channels.

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Definitions:

Fine Motor

Skills that involve the small muscles of the body enabling functions such as writing, grasping small objects, and fastening clothing.

Gross Motor

Pertains to the use and control of the large muscles of the body, such as those in the arms and legs, for activities like walking, running, and jumping.

Handedness

The natural preference for using one hand over the other, typically seen in actions like writing or throwing.

Lateralization

Tendency of each of the brain’s hemispheres to have specialized functions.