Movement Of Bands

Question 1

List of bands to be learnt

Answer 1

A band
I band

Question 2

List of lines to learn

Answer 2

M line
Z line

Question 3

List of zones to remember

Answer 3

H zone

Question 4

A band is…

Answer 4

The total width of myosin protein

Question 5

H zone is….

Answer 5

The area with only myosin where no actin overlaps

Question 6

I band

Answer 6

The area where only actin is

Question 7

M line

Answer 7

Midpoint of the myosin protein

Question 8

Z lines

Answer 8

Indicate the ‘parameters’ ends of each sarcomere in the myofibril

Question 9

What happens when the muscle contracts?

Answer 9

The sacromere shortens due to sliding filament theory: myosin heads pull actin along

Question 10

I band during contraction

Answer 10

This is part only actin covers; shortens because the actin slides over the myosin

Question 11

H zone when muscle contracts

Answer 11

Because the actin slides over myosin thus closer together, the area just the myosin covers (H zone) will decrease

Question 12

A band when muscle contracts

Answer 12

Remains constant: because this accounts for full length of myosin which does not move

Question 13

What happens to Z lines when muscle contracts?

Answer 13

Moves closer together thus the whole length of the sarcomere shortens