Muscles Flashcards
1
Q
Tendons and ligaments
A
Tendons - muscle to bone - allow contracting muscles to move bones
Ligaments - bone to bone - used as stabilisers
2
Q
Organisation of muscles
A
Skeletal muscles Bundles of fibres - held by tissue Fibres - long cells Myofibrils - structural unit Myofilaments - proteins Actin and myosin - filaments Sarcomere
3
Q
Sarcomere
A
Made of myosin (thick) and actin (thin)
The contractile unit of the muscles
4
Q
Sliding filament theory
A
Actin is alway moving. Myosin stays same place
Contract
Myosin heads attach to actin
Pull towards centre
H band shortens - a band shortens
Relax
Myosin heads detaching from actin
Lengthens h band when antagonistic pairs contracts
5
Q
H band
A
The distance between the actins
6
Q
A band
A
The length of the myosin
7
Q
Z line
A
Joining of Sarcomere
8
Q
The space between myosin and actin
A
changes
