1.1.8 Antagonistic muscle pairs

• When the agonist contracts, the antagonist relaxes
• What is the agonist when bending the elbow?

  Biceps
• The biceps and triceps reverse roles during elbow flexion and extension


  True
• What are the agonist and antagonist for hip flexion?

  Iliopsoas, Gluteus maximus
• Which muscle pair is responsible for ankle movement?

  Gastrocnemius, Tibialis anterior
• Steps in the reciprocal inhibition process

  1️⃣ Agonist muscle contracts

  2️⃣ Antagonist muscle relaxes

  3️⃣ Joint moves smoothly
• Reciprocal inhibition ensures smooth joint movement by coordinating agonist and antagonist actions

  True
• Match the antagonistic muscle pairs with their corresponding actions:

  Biceps/Triceps ↔️ Flexion/Extension of the elbow

  Deltoids/Pectoralis major ↔️ Abduction/Adduction of the shoulder

  Iliopsoas/Gluteus maximus ↔️ Flexion/Extension of the hip

  Gastrocnemius/Tibialis anterior ↔️ Plantar flexion/Dorsiflexion of the ankle
• The coordinated action of antagonistic muscle pairs is known as reciprocal inhibition.
• What is the role of the antagonist in antagonistic muscle pairs?

  To allow movement
• Steps in the reciprocal inhibition process during movement:

  1️⃣ The agonist muscle contracts

  2️⃣ The antagonist muscle relaxes

  3️⃣ The joint moves smoothly
• Antagonistic muscle pairs work in opposing directions to produce movement.


  True
• The reciprocal action of antagonistic muscle pairs allows for smooth, controlled movements of the joints.
• What principle is illustrated by the coordinated action of antagonistic muscle pairs during physical activities?

  Reciprocal inhibition
• During cycling, the gastrocnemius acts as the agonist for plantar flexion of the ankle, while the tibialis anterior acts as the antagonist.

  True
• What is the definition of antagonistic muscle pairs?

  Opposing muscles for movement
• Antagonistic muscle pairs work in opposing directions to produce movement


  True
• When extending the elbow, the triceps act as the agonist
• Match the muscle group with its antagonistic pair:

  Elbow ↔️ Biceps (agonist), Triceps (antagonist)

  Shoulder ↔️ Deltoids (agonist), Pectoralis major (antagonist)
• The gluteus maximus is the antagonist for hip flexion

  True
• The gastrocnemius causes plantar flexion, while the tibialis anterior causes dorsiflexion
• What is reciprocal inhibition in antagonistic muscle pairs?

  Coordinated muscle action
• The antagonist muscle relaxes to allow the motion to occur when the agonist contracts.
• What happens to the antagonist muscle when the agonist contracts during movement?

  It relaxes
• When the biceps act as the agonist during elbow flexion, the triceps serve as the antagonist.

  True
• The process by which the agonist contracts and the antagonist relaxes is called reciprocal inhibition.
• Match the antagonistic muscle pairs with their actions during elbow movement:

  Biceps ↔️ Flexion

  Triceps ↔️ Extension
• Which muscle pair allows flexion and extension of the elbow?

  Biceps and Triceps
• Match the physical activity with the antagonistic muscle pair and their actions:

  Running ↔️ Hamstrings/Quadriceps - Knee flexion/extension

  Swimming ↔️ Latissimus dorsi/Deltoids - Shoulder adduction/abduction

  Cycling ↔️ Gastrocnemius/Tibialis anterior - Ankle plantar flexion/dorsiflexion