The functional unit of a muscle is known as _
Correct answer: A. Sarcomere
- A. Sarcomere
- B. Sarcoplasmic reticulum
- C. Sarcoplasm
- D. Sarcolemma
Explanation
A sarcomere is the fundamental structural and functional unit of a muscle. It is located between two Z-lines (also known as Z-discs) and represents the portion of a muscle fiber (cell) that contracts during muscle contraction. Sarcomeres are highly organized units composed of overlapping thick and thin filaments (myofilaments) made up of proteins called myosin and actin, respectively. The interaction between myosin and actin filaments within the sarcomere generates the force required for muscle contraction.
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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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