A&P Muscles & Sliding Filament Theory

Actin is the ...

• Thick Filament within a Muscle Fibre

• Thin Filament within a Muscle Fibre

• Protein that covers myosin-binding sites

• Molecule that causes muscle contraction

Myosin is the ...

• Thin Filament of a muscle fibre

• Segment of a muscle fibre

• A molecule that changes shape when bound with Calcium Ions

• Thick Filament of a muscle fibre

True or False: Cross-bridges is when a myosin head attaches to an actin during contraction

• True

• False

The Z Line provides attachment for the ...

• Troponin

• Myosin

• Actin

• ATP

Myofibril is an arrangement of ___________ within a muscle fibre.

• Bands

• Sacromeres

• Proteins

• Crossbridges

_________ carries the impulse deep into the myofibrils.

• T-Tubules

• Synapses

• Sarcoplasm

• Neurotransmitters

True or False: Calcium Ions bind to Tropomyosin to change the shape of Troponin.

• True

• False

What does the Myosin Heads release to relax and pull the Actin filament?

• ATP

• ADP

• CNS

• ETC

What binds to the Myosin Head to cause it to detach from the Actin?

• ATP

• ADP

• CNS

• ETC

Tags

NGSS.HS-LS1-7

What causes the muscle to stop contracting?

• Lack of effort

• Myosin-Heads fail to attach

• Calcium Ions are pumped away

• Muscle fibre tears