muscular system Flashcards
How many muscles are in the muscular system?
Over 700 muscles
What type of muscles are primarily involved in producing human movement and activity?
Skeletal muscles
What are the two types of involuntary muscles?
- Cardiac (heart)
- Smooth (digestive system)
What connects skeletal muscles to bones?
Tendons
What is the nature of movements produced by skeletal muscles?
Generally voluntary
What is the smallest structural unit of a muscle?
Sarcomere
What energy source is used for muscle contraction?
ATP (adenosine triphosphate)
What forms myofibrils in muscle fibres?
A collection of sarcomeres
What holds muscle fibres together?
Fascia
What are the two types of muscle fibres?
- Slow-twitch muscle fibres (ST)
- Fast-twitch muscle fibres (FT)
What type of muscle fibre is recruited for endurance-type activity?
Slow-twitch muscle fibres (ST)
What type of muscle fibre is associated with power and explosive movements?
Fast-twitch muscle fibres (FT)
What are the two points of attachment for all skeletal muscles called?
Muscle origin and muscle insertion
Muscles can only contract and pull in one direction towards the _______.
Muscle origin
During a bicep curl, the muscle insertion is pulled towards the _______.
Muscle origin
