The Plateau Phase of the Action Potential in a Contractile

question 229

True/False

The plateau phase of the action potential in a contractile cardiac muscle cell occurs as a result of activation of slow Ca²⁺ channels.

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Definitions:

Chest X-ray

A diagnostic imaging test that uses a small amount of electromagnetic radiation to produce images of the structures inside the chest, including the heart, lungs, and bones.

Arterial Blood Gas

A test that measures the amounts of oxygen and carbon dioxide in the blood, as well as the acidity (pH) of the blood.

Oxygen Saturation

A measure of the amount of oxygen carried by the hemoglobin in the red blood cells, typically measured with a pulse oximeter; an important indicator of respiratory function.

Cyanosis

A bluish or purplish discoloration of the skin due to insufficient oxygen in the blood, often indicative of respiratory or circulatory issues.