Amoeba Sisters - Sliding Filament Theory

The muscle fiber is made up of:

• myotendons

• myoligaments

• myofibrils

• muscle cells

Myofibrils are made of smaller sections called sarcomeres. 

• True

• False

Actin is a ______ filament and myosin is a ____ filament.

• Thick, thin

• Thin, thick

The sarcomere shortens for muscles to contract.

• True

• False

The thick and thin filaments shorten when a muscle contracts.

• True

• False

The myosin head binds to the actin creating a _________.

• Charge

• Cross-Bridge

• Link

What allows the myosin filament to separate from the actin filament?

• ADP

• Phosphate group

• ATP

Which of the following is preventing the myosin from accessing the actin so calcium is needed to override these two items?

• Troponin

• nitrogen

• Tropomyosin