Musculoskeletal System Level 3 Flashcards
What is the outer membrane of a muscle called…
Epimysium
What is the term given to a bundle of muscle fibres..
Fasciculi
What is the outer sheath of a bundle of muscle fibres called.
Perimysium
What is the name of the membrane around each muscle fibre..
Endomysium
Individual muscle fibres are formed from what structure..
Myofibrils which contain proteins or myofilaments …..actin and myosin
What mechanism results in muscle contraction
The sliding filament mechanism
What are the 2 types of myofilaments
Actin ( thin filament)
Myosin ( thick filament)
What is the name given to the compartments that myofilaments are arranged in
Sarcomeres
Describe a tendon and it’s attachments
Tough in-elastic fibres which wrap around the end of the muscle and attach it to the outer layer of the bone.
Which are the thin and which are the thick myofilaments
Actin is thin and myosin is thick
Which structure attaches onto the actin filaments and pulls on these filaments
Myosin heads ( a series of hook like projections)
Why is calcium important to muscle contraction
The calcium causes the blocking molecule to move away from the binding site.
Describe the location and function of the sarcoplasmic reticulum
The sarcoplasmic reticulum are a network of tubes surrounding the myofibrils.
They act as calcium reservoirs
Identify the 3 types of muscle fibre
Type 1 slow twitch
Type 2a intermediate twitch fibres
Type 2b fast twitch fibres
Which muscle fibre type is most associated with long duration aerobic exercises
Type 1 or type 2a muscle fibres
