Skeletal Muscle Flashcards
Muscle belly is made up of bundles of muscle fibers, surrounded by connective tissue called?
Fasicles
A single muscle fibre is made from?
Many fused embryonic cells resulting in a single muscle fiber having multiple nuclei.
Inside each fiber is a bundle of ?
Myofibrils
Each myofibril contains a series of?
Sacromeres
A Sarcomeres contains?
The contractile filaments that convert action potential to muscle force.
Thin actin filaments attach where?
At the Z line
Thick Myosin filaments anchor where?
At the M line
Whole muscle shortening occurs as a result of ?
Filaments overlapping more, pulling the Z lines closer.
Whole muscle lengthening occurs as a result of?
Filaments overlapping less, Z lines are further apart.
Elastic Filament that anchors myosin to the Z line, contributing to passive force is?
Titin
The sliding filament model suggest?
During muscle contraction, the Myosin pulls Actin across shortening the muscle fiber and producing force.
Muscle is made up of many bundles of muscle fiber called?
Fascicles
Muscle fibers are surrounded by?
Endomysium
Muscle fibres are bind together in?
Fasicles
Muscle fascicles are surrounded by?
The perimysium
Mucles are surrounded by?
Epimysium
Muscle fibres are inverted by?
A motor neuron, direct from the spinal cord
A motor unit is equal?
one motoneuron, its motor axon and all muscle fibers it innovates
When sufficient excitatory input to reach firing threshold occurs?
An action potential is generated
Every action potential generated in the motor neuron generates ?
An action potential in the motor units of the muscle fibre
Muscle force is altered by?
The number and discharge rate of motor units and contractile properties of the muscle fiber.
