What Explains the Increased Concentration of Ca⁺⁺ in the ER

question 31

Multiple Choice

What explains the increased concentration of Ca⁺⁺ in the ER?

• A) Calcium ions are actively imported from the cytoplasm into the ER.
• B) Calcium concentration is kept low in the cytoplasm because of its high usage level.
• C) Calcium cannot enter the plasma membrane through ion channels.
• D) Calcium levels in the blood or other body fluids are extremely low.
• E) The Ca ions are recycled from other molecules in the ER.

---

Definitions:

Eyes rapidly move

A phenomenon occurring during REM (Rapid Eye Movement) sleep, where the eyes move quickly in various directions.

Sleep assessment

The evaluation of sleep patterns and quality to diagnose sleep disorders or to determine the impact of health conditions on sleep.

Medications

Substances used to diagnose, treat, cure, or prevent diseases and relieve symptoms in humans or animals.

Dinner

A main meal of the day, typically eaten in the evening.