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WorksheetsMuscle System Quiz
Total questions: 29
Worksheet time: 15mins
Which best describes the primary function of skeletal muscle in the musculoskeletal system?
Produce movement and stabilize joints
Secrete hormones into blood
Generate electrical impulses for the heart
Filter metabolic waste from blood
Which muscle property refers to the ability to generate force?
Contractility
Excitability
Conductivity
Compliance
Which muscle property refers to the ability to respond to a stimulus (e.g., neural input)?
Excitability
Elasticity
Extensibility
Viscosity
Which muscle property is the ability to be stretched without damage (within normal limits)?
Extensibility
Elasticity
Contractility
Excitability
Which muscle property refers to returning to original length after being stretched?
Elasticity
Extensibility
Excitability
Contractility
The connective tissue layer that surrounds an individual muscle fiber is the:
Endomysium
Perimysium
Epimysium
Fascia lata
The connective tissue layer that surrounds a fascicle is the:
Perimysium
Endomysium
Epimysium
Retinaculum
The connective tissue layer that surrounds the entire muscle is the:
Epimysium
Perimysium
Endomysium
Deep fascia
A sarcomere is best defined as:
The functional contractile unit between Z-discs
A bundle of muscle fibers
The membrane around a muscle fiber
The tendon connecting muscle to bone
During contraction, which filament slides past the other?
Thin (actin) slides over thick (myosin)
Thick (myosin) slides over thin (actin)
Both filaments shorten in length
Neither filament moves
According to sliding filament theory, the I-band during contraction:
Shortens
Lengthens
Stays the same
Disappears and reappears
According to sliding filament theory, the A-band during contraction:
Stays the same length
Shortens
Lengthens
Disappears
What directly binds to actin to allow cross-bridge cycling to begin?
Myosin head
Troponin
Calcium
Sodium
Calcium’s key role in initiating contraction is to:
Bind troponin and shift tropomyosin to expose binding sites
Bind myosin and split ATP directly
Bind actin to shorten thin filaments
Block myosin from binding to actin
ATP is required during cross-bridge cycling primarily to:
Detach myosin from actin and re-cock the myosin head
Allow calcium to enter the sarcomere
Create action potentials in the muscle membrane
Lengthen the thick filament
Where is calcium stored in skeletal muscle fibers prior to contraction?
Sarcoplasmic reticulum
Nucleus
Sarcolemma
T-tubule
T-tubules primarily function to:
Conduct action potentials deep into the muscle fiber
Store glycogen for ATP production
Synthesize actin and myosin
Attach muscle to tendon
Which fiber type is generally most fatigue resistant and rich in mitochondria?
Type I
Type IIx
Type IIb
Type IIa
Which fiber type is generally fastest and most fatigable (in humans)?
Type IIx
Type I
Type IIa
Type III
A muscle with fibers oriented at an angle to the tendon (e.g., pennate) generally has greater:
Physiological cross-sectional area and force potential
Fiber length and shortening velocity
Range of motion and excursion
Elastic recoil from tendon only
A fusiform (parallel) muscle is typically better suited for:
Large excursion and faster shortening
Highest maximal force at low velocity
Minimal change in length during contraction
Only isometric stabilization
Which is the best example of a muscle acting as a fixator?
Rotator cuff stabilizing the humeral head during arm elevation
Biceps brachii flexing the elbow
Gastrocnemius plantarflexing the ankle
Rectus femoris extending the knee
In an open-chain movement, the distal segment is typically:
Free to move
Fixed to a surface
Unable to accelerate
Always weight-bearing
Preloading a muscle (countermovement) prior to a concentric action is most associated with the:
Stretch-shortening cycle
Reciprocal inhibition
Fatigue failure principle
All-or-none law
Which statement best describes “preloading” in functional movement?
A rapid eccentric phase that prepares for a stronger concentric action
A prolonged concentric phase to reduce force output
A technique that eliminates elastic energy storage
A strategy that prevents motor unit recruitment
On the force–velocity relationship, concentric force tends to:
Decrease as shortening velocity increases
Increase as shortening velocity increases
Remain constant across velocities
Be higher than eccentric at all velocities
Which contraction type typically produces the greatest force capacity?
Eccentric
Concentric
Isometric
Passive only
Power is defined as:
Force multiplied by velocity
Force divided by time
Work divided by distance
Velocity divided by acceleration
In general, EMG amplitude is best interpreted as an indicator of:
Neural activation level (with context)
Direct muscle force output only
ATP concentration in the fiber
Length–tension curve peak
