Bundles of myofibrils are enclosed by the:
Correct answer: D. Muscle cell membrane or sarcolemma
- A. Neurolemma
- B. Nuclear membrane
- C. Sarcoplasmic reticulum
- D. Muscle cell membrane or sarcolemma
Explanation
Option D is correct.The muscle cell membrane is also known as the sarcolemma. It is the plasma membrane that surrounds a muscle fiber. It is a thin, flexible membrane that is made up of a lipid bilayer and a layer of proteins. The sarcolemma plays an important role in the contraction and relaxation of muscle fiber. The sarcolemma is made up of a lipid bilayer, which is a double layer of phospholipids. The phospholipids in the sarcolemma are arranged in a way that allows nutrients and oxygen to enter the muscle fiber and waste products to exit the muscle fiber.
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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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