Muscle Contraction-Sliding Filament Theory

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Identify the different types of molecules in the image.

a

b

c

d

Myosin

Actin

Troponin

Tropomyosin

T-tubule

Caicium Ion

Name an ion which causes the changes from A to B.

What is the name of the contractile unit in a muscle fibre?

• Sarcolemma

• Sarcomere

• Myofibril

• Fascicle

Which part of the sarcomere does NOT change length during muscle contraction?

• Z line

• I band

• A band

• H zone

What is the role of ATPase on the myosin head during muscle contraction?

• To bind calcium ions.

• To hydrolyze ATP into ADP and Pi for energy.

• To break actomyosin cross-bridge

• To pump calcium ions into sarcoplasmic reticulum