Quiz 3? Flashcards
Is crimp flexible
Yes , allows tendons to stretch and recoil efficiently, contributing to the elasticity and resilience of the muscle-tendon unit during movement.
What does all or nothing rule say
Every fiber needs to be activated
What is force determined by
Muscle fibers
Mf seated on the chair at gym show
Passive insufficiency
What do parallel fibers do
Give u greater range of motion ex are sartorius biceps brachii , good control , more speed but low force
Pennate fibers
Larger number of muscle fibers , On an angle \/ like this but strong , compact provide bad rom /speed
Muscle temp
Warm muscle leads to elastic muscle
Warm muscle
Decreases friction due to sliding filament theory
Series elastic component
Stores energy but lets it go when force is released
Parallel elastic components
passive structures within muscles that run parallel to muscle fibers, contributes to the elasticity and stiffness of muscles, helping to maintain muscle integrity and shape during contraction and stretching.
Proportional length of muscle
Creates greater force when at resting length /isolated conditions
Active insufficiency and myosin
Myosin and actin can’t line up
What’s inertia
objects like to keep doing what they’re already doing – staying still or moving – unless something pushes or pulls them to change.
increase the surface area over which a force is applied, the pressure decreases. Conversely, when you decrease the surface area, the pressure increases, assuming the force remains constant.
Location difference between sec and pec
Series elastic is in tendon and parallel is in muscles
Force -velocity relationship
As speed of contraction increases, force production decreases and vice versa
Why do we use inertia to stretch
property that makes objects resist changes in their motion or shape. So when we stretch something, For instance, when you perform a stretching exercise, such as a forward lunge, the initial movement stretches the muscle fibers. However, due to inertia, the muscle resists this change in length, contributing to the stretching sensation. This resistance helps to gradually increase flexibility and range of motion over time.
Relationship of eccentric with load and velocity
High load low velocity
Concentric , load and velocity
Low load high velocity
Why is greatest forced produced when slightly stretch
SEC releases its stored energy and PEC maintains muscle structure
Dislocation is at angle ?
0
Rotary is at angle
90
Stabilizing is at angle
180
Active tension
Force generated by muscle contraction , makes muscle shorten and produce movement ,
Passive tension
Force exerted on muscles when stretched , comes from elasticity , maintains shape and resist stretch : dnt evolve muscle contraction
Baseball pitch
Active tension allows pitcher to accelerate arm generate power ; passive tension contributes by relseasing stores energy to produce speed n power of pitch
What is the one thing that affects ROM
Muscle
What does articular cartilage act like
Shock absorption
Articular cartilage consist of
60-80% water , reduces friction , smooth surface facilities articulation
Músculo tendinoso unit
Responsible for converting chemical energy stored in atp into mechanical work
Contractile or internal forces
Active contraction of muscle fibers within muscle ; activate motor units within muscle by motor neurons ; generate movement posture and stabilize joints
Non contractile force
Muscle and joint function but dnt involve active muscle contraction ;
High load low velocity is eccentric contraction
Low load high velocity is concentric
