Muscle Basics
What is the main function of the muscular system?
Movement
What are the two contractile proteins found in myofilaments?
Actin and myosin.
What is the contractile unit
Sacromere
What are the neurons that control skeletal muscles called?
Bones act as what?
Levers
What are the three main functions of muscles besides movement?
Maintain posture, stabilize joints, and generate heat.
What is the name for a bundle of Muscle fibers
A fascicle.
What happens during contraction
Actin slides past myosin
What is the Neurotransmitter used in a somatic system
Joints act as what
Fulcrums
What is the Prime mover and the Antagonist in a Bicep Curl?
The biceps brachii is the prime mover, and the triceps brachii is the antagonist.
What connective tissue surrounds the entire muscle, each fascicle, and each muscle fiber?
Epimysium surrounds the whole muscle, perimysium surrounds each fascicle, and endomysium surrounds each muscle fiber.
What does Ca² do?
Binds trponin and moves trpopmyosin
Where does the neuron meet the muscle
Neuromuscular junction
Bicep curl = what lever?
Third-class
What is the difference between a synergist and a fixator?
Synergist helps movement; fixator stabilizes the origin
Put these in order from smallest to largest: muscle, fascicle, muscle fiber, myofibril, sarcomere.
Sarcomere → myofibril → muscle fiber → fascicle → muscle.
Why is ATP neccessary
It provides energy for myosin
Why do we use neurotransmitters
To carry the signal across the synaptic cleft
Mechanical advantage happens when
Effort is father form the fulcrum than the load
3 muscle roles in a movement?
Prime mover = main force; antagonist = opposes; synergist = helps
Which structure contains the actin and myosin filaments
Myofibrils
What causes a sacromere to shorten
Actin and myosin slide past each
What happens at the neuromuscular junction
ACh crosses the synpatic cleft and sends the signal to the muscle
Which lever has the load between the effort and fulcrum?