A person has a mutation that produces abnormal sarcoplasmic reticulum. Which of the following will not be a consequence of this mutation?
Correct answer: D. Calcium ions will not be released into a synapse
- A. The myosin heads will not bind the actin filaments
- B. Troponin will not be activated
- C. Tropomyosin will remain bound to actin
- D. Calcium ions will not be released into a synapse
Explanation
The calcium ions required for muscle contraction are released from the SR while those involved in the transmission of an impulse across a synapse are released via vesicles in the presynaptic neuron.
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About Support and Movement
Support and movement covers the axial and appendicular skeleton, bone structure, joints and the arrangement of skeletal muscles. Muscle contraction is explained through actin, myosin, sliding filaments, calcium ions and ATP, while arthritis is distinguished as a disorder of joints rather than a normal part of movement.
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