5. TRUE-FALSE T-F Amuscle\'s moment arm about a joint depends on joint angle. T-

Question

5. TRUE-FALSE T-F Amuscle's moment arm about a joint depends on joint angle. T-F The moment of inertia of a body is always largest about the center of mass T-F T-F The slope of a distance-time graph represents velocity. T-F The physiological cross-sectional area of pennate muscle is the same as the anatomical Impulse can be measured directly by measuring the area under the force-time curve. cross-sectional area T - F It is established that actin filaments slide toward the middle of myosin filaments during a muscle contraction.

Explanation / Answer

1. True

Moment arm lengths differs with joint angle, and they also depend on size of the muscle.

2. False

The moment of inertia is least about (axis passing through the) centre of mass

3. True

Area under the force time curve represents force*time which is equal to impulse.

4. False

The slope of a distance time graph represents SPEED.

5. False

The physiological cross sectional area of pennate muscle is NOT the same as the anatomical cross sectional area. Anatomical cross sectional area is the muscle cross sectional area where us physiological cross sectional area is the total area of cross section perpendicular to the muscle fibres.

6. False

As per the "sliding filament theory" the myosin filament slide past the actin filament during muscle contraction.

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