Sarcomere Structure And Function

Question 1

What are the four regions of a sarcomere?

Answer 1

1. H zone
2. A band
3. I band
4. Z disc

Question 2

What is the acronym, from inside to outside, for the regions in the sarcomere?

Answer 2

HAIZ

Question 3

From inside to outside, what are the types of regions of the sarcomere?

Answer 3

Zone band band disc

Question 4

What is the A band?

Answer 4

The length of the myosin

Question 5

What is the I band?

Answer 5

Actin but no myosin

Question 6

What is the H zone?

Answer 6

Myosin but no actin

Question 7

What is the Z disc?

Answer 7

The walls, neither actin nor myosin

Question 8

What regions of the sarcomere do not change the length?

Answer 8

A band and Z disc

Question 9

What regions of the sarcomere shorten when the muscle contracts?

Answer 9

H zone and I band

Question 10

What happens to the Z lines during concentric contraction?

Answer 10

They get closer together

Question 11

What does tropomyosin do when the muscle is not contracted?

Answer 11

Covers the myosin-binding site

Question 12

What activates troponin?

Answer 12

Calcium

Question 13

What does troponin do when calcium binds to it?

Answer 13

Pulls tropomyosin out of the way of myosin-binding sites