What is the agonist muscle for shoulder flexion?

• Latissimus dorsi

• Deltoid (anterior)

• Deltoid (posterior )

• Trapezius

Answer explanation

The agonist muscle for shoulder flexion is the anterior deltoid. It is primarily responsible for lifting the arm forward, while the latissimus dorsi and trapezius play different roles in shoulder movement.

What is the agonist muscle for shoulder extension?

• Deltoid (anterior fibres)

• Biceps brachii

• Deltoid (posterior)

• Pectoralis major

Answer explanation

The agonist muscle for shoulder extension is the deltoid (posterior). This muscle is primarily responsible for extending the arm backward, while the anterior fibers of the deltoid and other muscles are involved in different movements.

What is the agonist muscle for shoulder abduction?

• Deltoid (medial)

• Trapezius

• Latissimus dorsi

• Pectoralis major

Answer explanation

The deltoid muscle, particularly the medial part, is the primary agonist for shoulder abduction. It is responsible for lifting the arm away from the body, making it the correct choice over the other muscles listed.

What is the agonist muscle for shoulder adduction?

• Deltoid (anterior fibres)

• Latissimus dorsi

• Trapezius

• Biceps brachii

What is the agonist muscle for shoulder horizontal flexion?

• Pectoralis major

• Deltoid (posterior)

• Trapezius

• Latissimus dorsi

Answer explanation

The pectoralis major is the primary agonist for shoulder horizontal flexion, as it is responsible for bringing the arm across the body. The other muscles listed play different roles in shoulder movement.

What is the agonist muscle for shoulder horizontal extension?

• Deltoid (anterior)

• Pectoralis major

• Latissimus dorsi

• Deltoid (medial)

Answer explanation

The agonist muscle for shoulder horizontal extension is the latissimus dorsi. This muscle plays a key role in extending the arm backward, while the deltoid and pectoralis major are more involved in flexion and adduction.

What is the agonist muscle for elbow flexion?

• Triceps brachii

• Biceps brachii

• Deltoid (anterior)

• Latissimus dorsi

Answer explanation

The biceps brachii is the primary agonist muscle responsible for elbow flexion, as it contracts to bring the forearm closer to the shoulder. The triceps brachii, deltoid, and latissimus dorsi are not involved in this action.

What is the agonist muscle for elbow extension?

• Biceps brachii

• Deltoid (posterior)

• Triceps brachii

• Pectoralis major

Answer explanation

The triceps brachii is the primary agonist muscle responsible for elbow extension, as it contracts to straighten the arm. The biceps brachii, deltoid, and pectoralis major are involved in other movements.

What is the agonist muscle for hip flexion?

• Gluteus maximus

• Hamstrings

• Iliopsoas

• Quadriceps

Answer explanation

The iliopsoas is the primary agonist muscle for hip flexion, as it is responsible for lifting the thigh towards the torso. The gluteus maximus and hamstrings are involved in hip extension, while the quadriceps primarily extend the knee.

What is the agonist muscle for hip extension?

• Quadriceps

• Gluteus maximus

• Iliopsoas

• Hamstrings

Answer explanation

The gluteus maximus is the primary agonist muscle responsible for hip extension. It plays a crucial role in movements like standing up, climbing, and running, while the other muscles listed are not the main contributors to this action.