Skeletal Muscle

Question 1

How are myofibrils formed?

Answer 1

Myoblasts form –> Syncytium –> Sarcoemres end to end to MF

Question 2

What is the process of Myofibril to Muscle?

Answer 2

Myofibril –> Muscle Fibre –> Fascicles –> Muscle

Question 3

What are the 2 types of Muscle Fibres?

Answer 3

T1: Slow twitch with dark appearance and rich in ATPase
T2: Fast twitch with light appearance and less fibrillar ATPase

Question 4

What is a muscle fibre?

Answer 4

Intrafusal muscle fibre wrapped around by gamma efferent nerve fibres
(Act to detect tension and stretch of muscle)

Question 5

What are the 3 connective tissue layers and function?

Answer 5

Endomysium: Collagenous CT between the individual muscle fibres
Perimysium: Group of muscle fibre bound by CT –> Fascicles
Epimysium: Binds fascicles together (Found around the outside of muscle)

Question 6

What is the role of Sharpey’s Fibre?

Answer 6

Connect Epimysium with collagen of bone (Over large surface area)

Question 7

What are tendons histologically?

Answer 7

Parallel bundles of collagen with intervening fibroblasts (Muscle to bone over small area)