Muscle Functions and Roles

The video tutorial explains how muscles work together to create smooth and efficient movements by performing different roles: agonist, antagonist, fixator, and synergist. Agonists are the primary muscles responsible for movement, while antagonists oppose the movement. Fixators stabilize joints, and synergists assist in eliminating unwanted motions. The concept of reciprocal innervation is also discussed, highlighting the importance of smooth coordination between opposing muscle groups.

What are the four roles muscles can perform during movement?

• Agonist, Antagonist, Fixator, Synergist

• Flexor, Extensor, Stabilizer, Rotator

• Prime Mover, Secondary Mover, Stabilizer, Rotator

• Contractor, Relaxer, Stabilizer, Rotator

Which muscle is considered the prime mover in elbow extension?

• Triceps Brachii

• Anconeus

• Biceps Brachii

• Deltoid

What role does the biceps brachii play during elbow flexion?

• Antagonist

• Agonist

• Fixator

• Synergist

What is the primary function of fixator muscles?

• To produce movement

• To oppose movement

• To stabilize joints

• To eliminate unwanted motion

Which muscles act as fixators during arm movements?

• Trapezius and Rhomboids

• Biceps and Triceps

• Deltoid and Pectoralis Major

• Latissimus Dorsi and Teres Major

What is the role of synergist muscles?

• To eliminate unwanted motion

• To stabilize joints

• To oppose movement

• To produce movement

What happens to muscle strength when the wrist is flexed during a grip?

• It remains the same

• It increases

• It decreases

• It fluctuates

What is reciprocal innervation?

• The process of muscles contracting simultaneously

• The coordination of muscle contraction and relaxation

• The stabilization of joints during movement

• The elimination of unwanted motion

Why is reciprocal innervation important?

• To increase muscle strength

• To eliminate unwanted motion

• To stabilize joints

• To ensure smooth and continuous movement

What can result from poor reciprocal innervation?

• Smooth muscle movement

• Increased muscle strength

• Stabilized joints

• Herky-jerky motions