Muscles and Movement Lesson

What are antagonistic muscles?

• Pairs of muscles that work together

• Pairs of muscles that work against each other

• Pairs of muscles that push bones

• Pairs of muscles that only contract

What is the action of increasing the angle of corresponding bones called?

• Relaxation

• Contraction

• Flexion

• Extension

Which muscle straightens the arm at the elbow?

• Hamstrings

• Biceps

• Triceps

• Quadriceps

How do muscles move bones at the joint?

• By contracting and pushing on the bones

• By relaxing and pushing on the bones

• By contracting and pulling on the bones

• By pushing on the bones

When is movement possible?

• When muscles only relax to move bones

• When muscles only contract to move bones

• When muscles push bones at the joints

• When muscles contract and relax, working in pairs to move bones at the joints

What is the action of decreasing the angle of corresponding bones called?

• Contraction

• Flexion

• Relaxation

• Extension

Which muscle bends the leg at the knee?

• Triceps

• Biceps

• Hamstrings

• Quadriceps

What is the term used when discussing antagonist muscle pairs and their actions?

• Bender and Straightener

• Contractor and Relaxer

• Extensor and Flexor

• Flexor and Extender