Crash Course Sliding Filament Model

___are thin filaments.

• troponin

• tropomyosin

• actin

• myosin

___are thick filaments.

• actin

• myosin

• troponin

• tropomyosin

A ___extends from one Z line to another Z line.

• Sarcolemma

• Neuromuscular junction

• Sarcomere

• Motor end plate

___gets shorter during contraction.

• actin

• myosin

• cross bridges

• H-Zone

___forms a crossbridge with actin.

• actin

• myosin

• calcium

• ATP

___provides energy for muscle contraction and relaxation.

• cAMP

• ADP

• ATP

• M line

___slides inward during muscle contraction.

• actin

• myosin

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

• fascicle
• sarcomere
• tendon
• endomysium

The plasma membrane of a skeletal muscle cell is called the:

• sarcomere

• myofilament

• sarcolemma

• sarcoplasm

What state is the sarcomere in #1

• Relaxed
• Contracting
• Fully Contracted
• None of the above