Which Statement About Ion Movements and Ventricular Muscle Cells Is

question 90

Multiple Choice

Which statement about ion movements and ventricular muscle cells is false?

• A) Sustained opening of Ca²⁺ channels is responsible for the extended plateau phase of the action potential.
• B) Cardiac muscle is stimulated to contract when Ca²⁺ is available to bind with troponin.
• C) For ventricles to fill again, Na⁺ must be removed from the sarcoplasm.
• D) Ca²⁺ ions are actively transported out of the sarcoplasm and into the sarcoplasmic reticulum.
• E) When Ca²⁺ remains in the sarcoplasm, ventricular muscle cells continue to contract.

---

Definitions:

Dissociation

A psychological condition characterized by a disconnection between thoughts, identity, consciousness, and memory, often as a response to trauma or stress.

Psychological Process

The mental function or activity that underlies individual behavior and response to stimuli.

Somatic Symptom Disorders

Disorders characterized by an excessive focus on physical symptoms, such as pain or fatigue, that causes major emotional distress and problems in functioning.

Dissociation

A psychological experience of feeling disconnected or detached from one's mind, body, or surroundings, often as a response to trauma or extreme stress.