Skeletal Muscles Flashcards
1
Q
What pairs do muscles work together in
A
Work together in antagonistic pairs against an incompressible skeleton
2
Q
What are antagonistic pairs
A
While one muscle contracts the other relaxes
3
Q
Describe the features of a single muscle fibre
A
- each fibre surrounded by a plasma membrane called the sarcolemma
- each muscle fibre (cell) has been formed from several cells (with the plasma membrane separating them broken down)
4
Q
Describe features of myofibrils
A
- composed of actin + myosin filaments, repeated in units called sarcomeres
5
Q
What is a sarcomere
A
Repeated units of myofibrils, composed of actin + myosin (forms basic machinery necessary for muscle contraction)
