L11: Skeletal Muscle Organ, Structure and Function Flashcards
what are the three types of muscles?
- cardiac
- skeletal
- smooth
what makes up skeletal muscle tissue?
- muscle cells
- extracellular matrix (minimal)
muscle cell/fibre are/consist of?
- multinucleated
- myofibrils
what are myofibrils?
- bundles of myofilaments
what are myofilaments?
- actin and myosin contractile proteins
classification of type 1 skeletal muscle cells
- slow oxidative
- slow aerobic
size of type 1 skeletal muscle cells
smallest
function and power of type 1 skeletal muscle cells
- fatigue resistant
- least powerful
classification of type 2a skeletal muscle cells
- fast oxidative
- fast aerobic
size of type 2a skeletal muscle cells
- intermediate
fatigue resistance of type 2a skeletal muscle cells?
- some fatigue resistance
classification of type 2b skeletal muscle cells
- fast glycolytic
- fast anaerobic
size of type 2b skeletal muscle cells
- largest
Properties of type 2b skeletal muscle cells
- fatigue
- most powerful
- most common
each muscle contains a combination of the fibre types
TRUE or FALSE?
- true
- %s vary according to function
how many tissues present in skeletal muscle organs?
- 4 tissues
what is a myotendinous junction?
- collagen fibrils of the tendon attach to the end of the muscle fibres
what is ethesis?
- where a tendon or ligament attaches to bone
what do collagen fibrils attach to?
- periosteum and/or anchor into the bone tissue
what is a motor unit?
a single motor neuron and the muscle fibres it innervates
what is an isometric contraction?
- muscle force matches load
- constant length
what are isotonic contractions?
- concentric
- eccentric