Exploring Agonists, Antagonists, and Muscle Contractions

This video tutorial covers the basics of muscle movement, focusing on the roles of agonists and antagonists. It explains how muscles work in pairs to facilitate movement, using examples like the bicep and tricep. The video also details various muscle groups and their functions, joint actions, and the types of muscle contractions, including isotonic, concentric, eccentric, and isometric. Finally, it provides practice questions to reinforce learning.

What is the anchor point for the bicep muscle?

• Clavicle

• Radius

• Scapula

• Humerus

Which muscle acts as the antagonist when the bicep contracts?

• Pectoralis major

• Deltoid

• Latissimus dorsi

• Tricep

What is the role of the quadriceps during knee flexion?

• Fixator

• Antagonist

• Agonist

• Synergist

Which muscle is primarily responsible for hip abduction?

• Tensor fasciae latae

• Abductors

• Gluteus medius

• Pectoralis major

Which muscle group is split into three smaller muscles including the biceps femoris?

• Gluteals

• Abductors

• Quadriceps

• Hamstrings

Which type of muscle contraction occurs when the muscle shortens?

• Concentric

• Isometric

• Eccentric

• Isotonic

What is the main function of the deltoid muscle during shoulder abduction?

• To act as an agonist

• To contract

• To relax

• To act as an antagonist

What is the main action of the tibialis anterior during ankle dorsiflexion?

• Synergist

• Antagonist

• None of the above

• Agonist

Which muscle action is primarily involved when a muscle does not change its length but maintains tension?

• Concentric

• Eccentric

• Isometric

• Isotonic

During the downward phase of a squat, what type of contraction do the hip muscles primarily perform?

• Isometric

• Concentric

• Eccentric

• Isokinetic