Muscle Contraction

A is pointing to?

• Sarcomere 
• Z disk
• A band
• I band

B is pointing to?

• Sarcomere 
• Z disk
• A band
• I band

C is pointing to?

• H zone
• Z disk
• actin
• I band

D is pointing to?

• H zone
• Z disk
• A band
• I band

E is pointing to?

• H zone
• Z disk
• A band
• I band

F is pointing to?

• H zone
• Actin
• A band
• Sarcomere 

the __ zone of a sarcomere contains no actin filaments while the skeletal muscle is at rest

• H
• Z
• synaptic cleft
• sarcomere

when skeletal muscle is fully contracted, the __ are closer to the thick filament

• H
• Z
• synaptic cleft
• sarcomere

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

• H

• Z

• synaptic cleft

• sarcomere

tiny chains of contractile units between 2 Z disks, which are aligned end to end

• H
• Z
• synaptic cleft
• sarcomere