NEET Exam > NEET Notes > Biology Class 11 > DPP for NEET: Daily Practice Problems, Ch: Locomotion and Movement
DPP for NEET: Daily Practice Problems, Ch: Locomotion and Movement
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FAQs on DPP for NEET: Daily Practice Problems, Ch: Locomotion and Movement
| 1. How do muscles and bones work together to create movement in the body? |  |
Ans. Muscles and bones function as a lever system where muscles contract to pull bones across joints, enabling locomotion. Skeletal muscles attach to bones via tendons, while ligaments stabilise joints. When motor neurons stimulate muscle fibres, they shorten, producing coordinated movement patterns essential for walking, running, and athletic activities.
| 2. What's the difference between smooth muscle and skeletal muscle contraction? | |
Ans. Skeletal muscles contract rapidly under voluntary control via somatic nervous stimulation, enabling precise movements like typing or jumping. Smooth muscles contract slowly and involuntarily, regulating internal organ functions such as digestion and blood vessel constriction. Cardiac muscle combines properties of both, contracting rhythmically without conscious effort.
| 3. Why do muscles get tired and how does the sliding filament theory explain muscle fatigue? | |
Ans. Muscle fatigue occurs when ATP depletion reduces myosin-actin cross-bridge formation, limiting contraction force. The sliding filament mechanism describes how thick filaments (myosin) pull thin filaments (actin) across sarcomeres, shortening muscle length. Lactic acid accumulation and calcium depletion further impair contraction velocity and strength during sustained physical activity.
| 4. What role do synovial joints play in allowing different types of movement? | |
Ans. Synovial joints permit diverse movement patterns-flexion, extension, rotation, and circumduction-through their fluid-filled cavities and cartilage-covered articulating surfaces. Synovial fluid reduces friction between bone ends, enabling smooth, efficient locomotion. Ligaments and muscle tendons stabilise these joints, preventing injury during complex physical activities requiring precision and range.
| 5. How do antagonistic muscle pairs create controlled movement at joints? | |
Ans. Antagonistic muscles work in opposing pairs-one contracts (agonist) while the other relaxes (antagonist)-producing smooth, controlled movement across joints. Synergistic muscles assist primary movers, refining motion precision. This coordinated neuromuscular regulation prevents jerky movements and enables delicate tasks like writing alongside powerful actions like jumping during athletic performance.
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Apr 18, 2026 Last updated
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