BIO II Module 6 Review

The neuromuscular junction is:

• The space where motor neuron axon and the muscle interact

• Inside the muscle cell

• In the brain

• The place where the muscle contracts

Acetylcholine is:

• not necessary to start a muscle contraction

• the unit that actually contracts in the muscle fiber

• the signal molecule that moves from the motor neuron to the muscle fiber

• used to slide myosin and actin fibers over each other

Calcium is important in muscle contraction because:

• It helps troponin to remove tropomyosin and uncovers myosin binding sites

• It breaks ATP into ADP and P

• Muscles get their energy from calcium

the gap between the motor neuron and the muscle fiber it supplies at the neuromuscular junction

• H

• Z

• synaptic cleft

• sarcomere

plasma membrane of a muscle cell

• sarcolemma
• sarcoplasmic reticulum
• thick filament
• thin filament

Which of the following occur when ATP binds to the myosin head?

• Myosin head change to low energy configuration

• Myosin head undergoes power stroke

• Myosin head detach from actin

• Myosin head forms cross bridge

During muscle contraction the 'Z' Lines will...

• Disappear
• Get Farther apart
• Get Closer Together
• Appear Thicker

During full muscle contraction the A Band will...

• Disappear
• Get wider
• Stay the same
• Get narrower

The connective tissue sheath that surrounds a muscle fasciculus is the

• epimysium

• endomysium

• perimysium

Thick and thin filaments change in length during contraction

• True
• False