Intercalated Disks Are Cell- Cell Junctions Found Between Cardiac Muscle

question 26

Multiple Choice

Intercalated disks are cell- cell junctions found between cardiac muscle cells. A feature of intercalated disks is a large number of gap junctions. This means

• A) an extension of smooth endoplasmic reticulum goes through the gap junction, making it continuous from one cardiac muscle cell to the next.
• B) water and small ions can readily pass from one cardiac muscle cell to the next.
• C) RNA from one cardiac muscle cell can be transported into an adjacent cell through the gap junction.
• D) the plasma membrane encompasses multiple cardiac muscle cells.

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Definitions:

Chloride Shift

The chloride shift is a process during which chloride ions move from the blood plasma into red blood cells as bicarbonate ions leave, helping maintain ionic balance in blood during gas exchange.

Vital Capacity

The maximum amount of air a person can expel from the lungs after a maximum inhalation.

Tidal Volume

The amount of air that is inhaled or exhaled during normal breathing with each respiratory cycle.

Residual Capacity

The amount of air remaining in the lungs after a normal expiration, critical for continuous gas exchange between breathing cycles.