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Question #46866
The Question
Intercalated discs, which include gap junctions, allow cardiac muscle to function as a coordinated syncytium. If a hypothetical genetic mutation caused the widespread formation of functional intercalated discs between adjacent skeletal muscle fibres, which of the following physiological capabilities would be most directly and severely compromised?
Options
- A.
The generation of end-plate potentials at the neuromuscular junction
- B.
The gradation of contractile force through independent motor unit recruitment
- C.
The release of calcium ions from the sarcoplasmic reticulum upon depolarization
- D.
The propagation of the action potential deep into the sarcoplasm via T-tubules
Check Your Answer
Correct Answer
Step-by-Step Solution
Explanation
How the Examiner Thinks
Evolutionary_Exception
Tackle problems where standard rules evolve or change based on specific environmental constraints.
Concepts Behind This Question
Intercalated Disc Function|Skeletal Muscle Striation Pattern|Vestigial Organs Interpretation
Why This Question Is Tricky
Common Mistakes
Conceptual Pivot: Students often memorize that intercalated discs are unique to cardiac muscle without understanding the evolutionary constraint.
The misconception is viewing gap junctions purely as an 'upgrade' for faster conduction, failing to realize that the electrical isolation of skeletal muscle fibres is an absolute structural necessity for independent motor unit recruitment and precise voluntary movements.
Quick Facts About This Question
Question Information
| Subject | Biology |
| Chapter | Structural Organisation in Animals - Class 11 |
| Concept | Intercalated Disc Function |
| Difficulty | 8 |
| Cognitive Load | 5 |
| Target Solve Time | 120 sec |
| Access | Free |