Muscle Contractions

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

• concentric contraction

• eccentric contraction

• isometric contraction

What type of contraction is happening here??

• isostabilize

• isokinetic

• isotonic

• isometric

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

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

During the upward phase (pressing) which muscle is undergoing concentric contraction?

• biceps

• triceps

• abdominals

• quads

During the downward phase of the squat, which muscle is undergoing eccentric contraction?

• quads

• hamstrings

• abdominals

• shoulders