Muscle Contraction Quiz

What activity is mentioned as an example of muscle contraction without length change?

• Cycling

• Gripping a tennis racquet handle

• Lifting weights

• Dancing

During a concentric isotonic contraction, what happens to the muscle?

• The muscle lengthens

• The muscle shortens

• The muscle stays the same

• The muscle disappears

What is an example of an eccentric isotonic contraction?

• Up phase of a bicep curl

• Down phase of a bicep curl

• Holding a weight still

• Stretching a muscle

What is the key feature of isokinetic exercise machines?

• They are portable

• They are inexpensive

• They produce constant speed

• They are easy to use

What is an isotonic contraction? Give an example (not already given in class).

• A contraction where the muscle length changes

• A contraction where the muscle length stays the same

• A contraction with variable speed

• A contraction with no movement

When are isokinetic contractions mostly used?

• During rehabilitation exercises

• During sprinting

• During weightlifting

• During yoga

Which of the following is a role of skeletal muscles?

• Agonist

• Catalyst

• Inhibitor

• Regulator

Which of the following is NOT a role of skeletal muscles?

• Agonist

• Synergist

• Antagonist

• Regulator

Which role involves stabilizing the origin of the agonist?

• Agonist

• Synergist

• Antagonist

• Fixator

Which muscle group acts as a synergist during a back squat?

• Biceps

• Triceps

• Gluteal muscles

• Abdominal muscles