What is a sarcomere?
Correct answer: D. The contractile unit of a muscle cell
- A. The fibers that make up skeletal muscles
- B. The smallest unit of a smooth muscle
- C. A myosin fibril
- D. The contractile unit of a muscle cell
Explanation
A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments-actin and myosin-which are the active structures responsible for muscular 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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Which of the following joint is also known as ellipsoidal joint?
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