Muscle Contraction Quiz

A neurotransmitter that stimulates skeletal muscles

• acetylcholine (Ach)

• ATP

• cross bridges

• neuromuscular junction

The only energy source that can be used to directly power muscle contraction is

• acetylcholine (Ach)

• ATP

• cross bridges

• neuromuscular junction

The heads of the myosin myofilaments form __ when they link the thick and the thin filament together

• acetylcholine (Ach)

• ATP

• cross bridges

• neuromuscular junction

What is the function of Calcium during a skeletal muscle contraction?

• connects to H zone to close binding sites

• connects to actin to open binding sites

• connects to myofibril to form a cross bridge

• connects to myosin to open binding sites

What is the name of the thin myofilaments in the muscle cell?

• Actin
• Myosin
• Myoglobin
• Titan

What is the name of the thick myofilaments?

• Actin
• Myosin
• Myoglobin
• Titan

The contractile unit of a muscle is called the __________.

• Sarcolemma
• Sarcoplasmic reticulum
• Sarcoplasm
• Sarcomere

The Sliding Filament Theory states that

• contraction occurs due to the shortening of thick filaments

• contraction occurs due to the shortening of thin filaments

• contraction occurs due to the sliding of thin filaments past thick filaments

• contraction occurs due to the "accordian-like" folding of thick and thin filaments

Study the diagram. During muscle contraction the Z-lines will...

• disappear

• get farther apart

• get closer together

• appear thicker

Study the diagram. During full muscle contraction the A Band will...

• disappear

• get wider

• stay the same

• get narrower