Muscle contractions

Which of these muscles types have VOLUNTARY contractions?

• Cardiac

• Skeletal

• Smooth

Which is considered the "main mover"

• Agonist muscle

• Antagonist muscle

• Smooth muscle

• Cardiac muscle

What type of muscle is considered the opposing muscle during a given movement

• Agonist muscle

• Antagonist muscle

• Smooth muscle

• Cardiac muscle

Which muscle group is responsible for flexion at the knee when a footballer prepares to kick a football?

• Quadriceps

• Gluteus maximus

• Hamstrings

• Femur

Concentric contraction ______ muscles

• shorten

• lengthen

Muscles contraction which increase in length

• Twitch

• Isotonic

• Concentric

• Eccentric

no movement or shortening, but tension with muscle increases

• Isotonic

• Concentric

• Eccentric

• Isometric

Answer explanation

The type of muscle contraction where the muscle tenses but does not shorten.  

• Isometric
• Isotonic
• Contraction
• relaxation

As the athlete lowers the weights, his biceps undergo-

• concentric contraction

• eccentric contraction

• isometric contraction

As this athlete jumps into the air, his quadriceps undergo-

• concentric contraction
• eccentric contraction
• isometric contraction