Support & Movement

Identify role of Calcium (Ca) during muscle contraction

• To open sarcoplasmic reticulum (SR) open

• To bind with troponin

• To initiate more Calcium enter the cell

• No roles in muscle contraction

Which area of a sarcomere contains only actin?

• Z disk

• A band

• H zone

• I band

Which part of the sarcomere does not shorten during muscle contraction?

• A band

• H zone

• I band

• None of these

Firm but flexible tissue that is part of the skeletal system.

• cartilage

• bone

• muscles

• ligament

Connective tissue that holds bones together at many joints.

• ligament

• tendon

• cartilage

• muscle

Connective tissue that attaches skeletal muscle to bone.

• tendon

• ligament

• cartilage

• joint

Smooth and cardiac muscle that is not under the conscious

control of the organism.

• involuntary muscle

• voluntary muscle

What is M Line?

• Distance between two region

• Holding Thin filament

• Overlapping parts

• Holding Thck filament

During muscle contraction, if troponin not change its shape, what happen to state of muscle contraction?

• Muscle will not contract

• Muscle will fatigue

• Muscle will cramp

• Muscle will continue to contract

Identify the relationship between tropomyosin and thin filament during muscle contraction.

• Tropomyosin will change shape to allow Calcium to enter

• Tropomyosin will move away to expose active site

• Tropomyosin will bind to troponin

• Tropomyosin will stop the contraction