Skeletal Muscles Flashcards
What are the characteristics of skeletal muscle ?
Striated and voluntary
What are the functions of skeletal muscle ?
- Movement of the body and/or its parts
- Posture
- Heat production
Digastric
Two muscle bellies connected by a tendon
Tendon
Connect muscle to bone
Origin
Stationary or fixed end of a muscle
Insertion
The site where bone and muscle are attached and move during contraction
1st class level system
The joint is in the middle
What is the most common lever class in the body ?
3rd class
What is a 2nd class lever ?
Where the resistance is in the middle
What are the different muscle shapes ?
Parallel, circular, convergent and pennate
What is the weakest muscle fibre shape ?
Parallel
What are aponeurosies ?
Broad, flat tendons
What is the function of tendons ?
To transfer the force of muscle pull to bone to facilitate joint movement
What are the regions for attachment of tendons to the musculoskeletal system?
Myotendinous and osteotendinous
What are tendons mainly composed of ?
Type 1 collagen
Isotonic
“Constant tension”
Change in the length of the muscle
Concentric
Muscle gets shorter when it contracts
Eccentric
Muscle lengthens when it contracts
Isometric
“Constant length”
Muscle contracts but stays the same length
Prime mover
Generates the basic movement
Synergist
Helps the prime mover
Fixator
Stabilises bones to allow movement to take place
