Which of the following is a correct statement about skeletal muscles?
Skeletal muscles are striated and under voluntary control.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Skeletal System - Axial Skeleton - Ribs Sternum
#muscle biology
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Which statement about myosin filaments is correct?
Myosin heads contain ATPase, which helps in ATP hydrolysis for muscle contraction.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Muscle Contraction - Sliding Filament Theory and Regulation
Which of the following statements about muscle fibers is incorrect?
Skeletal muscle fibers are voluntary, not involuntary.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Muscle - Types and Structure - Myofibril Sarcomere Myofilament
What is the major function of actin in muscle contraction?
Actin filaments interact with myosin during muscle contraction, leading to movement.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Muscle - Types and Structure - Myofibril Sarcomere Myofilament
Which of the following structures is responsible for anchoring actin filaments in a sarcomere?
The Z-line anchors actin filaments and marks the boundary of a sarcomere.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Muscle - Types and Structure - Myofibril Sarcomere Myofilament
What is the functional unit of muscle contraction?
The sarcomere, composed of actin and myosin filaments, is the functional unit of muscle contraction.
Ref: NCERT Class 11 Biology Chapter 17: Locomotion and Movement Muscle - Types and Structure - Myofibril Sarcomere Myofilament