Structure of a Sarcomere
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22 Terms
What is the smallest unit of a muscle to contract?
Sarcomere
____ is the thin myofilament. _____ is the thick myofilament.
Actin and Myosin
_____ has “hands” that bind to ____
Myosin, Actin
Which myofilament looks like two strands of pearls?
Actin
Why myofilament is attached to the Z line?
Actin
Which part of a sarcomere contains only thick filaments?
H zone
Which part of a sarcomere contains only thin filaments?
I band
Which part of the sarcomere is the boundary between sarcomeres?
Z line
Which part of the sarcomere contains both actin and myosin?
A band
Which part of the sarcomere is the line down the middle of myosin?
M line
Which part of the sarcomere runs the entire length of myosin?
A band
Which part of the sarcomere is the dark band?
A band
Which part of the sarcomere is the light band?
I band
Which myofilament pulls the other when a muscle contracts?
Myosin
True or False: When a sarcomere contracts, actin and myosin stay the same length.
True
What is needed for myosin to be able to grab and pull actin?
Ca 2+ Ions
What happens to the I bands when a sarcomere goes from relaxed to contracted?
The I band shortens and disappears
What happens to the Z lines when a sarcomere goes from relaxed to contracted?
The Z lines get closer together
What happens to the A band when a sarcomere goes from relaxed to contracted?
The A band does not change at all
What happens to the H zone when a sarcomere goes from relaxed to contracted?
The H zone shortens and disappears
True or False: When a sarcomere contracts, actin moves further away from the M line
False
When a sarcomere contracts, myosin moves closer to the Z line
True
Note 
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