Muscular System Flashcards
1
Q
Which muscles are il voluntary
A
Smooth and cardiac
2
Q
What does it mean by antagonistic pair
A
One muscle contracts to move a bone, another contracts to return it to its position.
3
Q
Define agonist
A
Prime mover
4
Q
Define antagonist
A
Relaxed muscle
5
Q
Define insertion
A
Moving joint
6
Q
Define origin
A
Non moving joint
7
Q
Define synergistic muscle
A
Or fixator, stabilise joint
8
Q
Explain the muscle structure
A
- Constructed of muscle fibres
- each muscle fibre composed of many myofibril
- myofibril made up of contractile units called sarcomeres, which run adjacent to one another down myofibril
- sarcomeres composed of alternating protein filaments called actin and myosin
9
Q
What are sarcomeres in relation to size and muscle
A
Smallest unit of skeletal muscle that can contract
10
Q
What gives muscle the striated appearance
A
Alternating filaments
11
Q
Which filiaments are thick and thin
A
Actin= thin, myosin = thick
12
Q
Explain the sliding filament theory
A
- the sliding action between two filaments causing shortening and contraction
- the myosin has projections that hook, onto the actin
- when triggered, the projections attach, detach and reattach to a new spot on the actin as it pulls it along side it.
- results in sliding action, shortening, and eventual contraction.
13
Q
Name the three types of muscles
A
Cardiac, striated., smooth
