Muscle Roles in Movement

The video tutorial by Nivedita from Sri Ahana Physiotherapy Academy explains the roles of agonists, antagonists, and synergists in muscle movement. Agonists are the primary muscles responsible for movement, such as the biceps in elbow flexion. Antagonists, like the triceps, oppose the movement. Synergists assist by stabilizing or supporting the movement. An example of radial deviation is used to illustrate these roles. The video concludes with a call to action for viewers to apply their understanding by identifying these roles in other joint movements.

What is the primary role of an agonist muscle in movement?

• To act as the prime mover

• To oppose the movement

• To assist the antagonist

• To stabilize the joint

Which muscle acts as the prime mover during elbow flexion?

• Pectoralis major

• Deltoid

• Biceps

• Triceps

What is the role of an antagonist muscle?

• To initiate movement

• To oppose the action of the agonist

• To stabilize the joint

• To assist the prime mover

Which muscle acts as the antagonist during elbow flexion?

• Biceps

• Triceps

• Brachialis

• Flexor carpi radialis

What is the function of synergist muscles?

• To oppose the agonist

• To act as the prime mover

• To assist and stabilize movements

• To initiate movement

Which muscle acts as a synergist during wrist flexion and radial deviation?

• Brachioradialis

• Triceps

• Flexor carpi radialis

• Extensor carpi ulnaris

How can a muscle act in different roles during movement?

• By changing its structure

• By being part of different muscle groups

• By altering its length

• By acting as an agonist, antagonist, or synergist depending on the movement

What determines whether a muscle acts as an agonist or antagonist?

• The size of the muscle

• The speed of movement

• The desired action or movement

• The type of joint involved

In the context of muscle roles, what does the term 'prime mover' refer to?

• The muscle that stabilizes the joint

• The muscle that assists the main action

• The main muscle responsible for a specific movement

• The muscle that opposes the main action

Which of the following is NOT a role a muscle can play?

• Agonist

• Antagonist

• Synergist

• Inhibitor