Structure of a skeletal muscle fibre

Question 1

Describe sarcomeres

Answer 1

have many filaments

from z line to z line

Question 2

What does muscle contraction do to sarcomeres?

Answer 2

shortens it

pulling of muscle against its attachment

Question 3

What are myofibril made up of

Answer 3

sarcomere

Question 4

What are the I band made up of?

Answer 4

Light band
actin thin filaments
Join the z line

Question 5

What is The A band made up of and do?

Answer 5

Dark band
Made up of thick and thin filaments
for contraction and relaxation

Question 6

Where is the H zone and what does it do?

Answer 6

middle part of A band

Contains myosin filaments

Question 7

Where is the M line and what does it do?

Answer 7

Middle of H zone

Protein which holds myosin filaments in place

Question 8

What does the binding of thick and thin filaments cause?

Answer 8

Pulling force

Shortening of overlap of the two as they slide past each other

Question 9

What does shortening of muscle fibres result in?

Answer 9

Shortening of the entire muscle- then pulls on the attached body part which cause movement