WorksheetsIB SEHS Muscle contractions & Movement Analysis Quiz
Total questions: 42
Worksheet time: 1hrs 24mins
What is an agonist muscle?
A muscle that stabilizes a joint
A muscle that contracts concentrically to cause movement
A muscle that opposes movement
A muscle that lengthens during contraction
What type of contraction occurs when a muscle shortens while generating force?
Isometric contraction
Eccentric contraction
Concentric contraction
Isokinetic contraction
What is an antagonist muscle?
A muscle that assists the prime mover
A muscle that never contracts
A muscle that opposes the agonist
A muscle that stabilizes the joint
What type of contraction occurs when muscle length stays the same but tension is generated?
Eccentric contraction
Concentric contraction
Isotonic contraction
Isometric contraction
What is a fixator muscle?
A muscle that stabilizes a joint during movement
A muscle that causes primary movement
A muscle that opposes movement
A muscle that only works during stretching
During an eccentric contraction, what happens to the muscle?
It stays the same length
It lengthens while contracting
It shortens while contracting
It completely relaxes
What is reciprocal inhibition?
When all muscles contract simultaneously
When both agonist and antagonist contract together
When the antagonist relaxes as the agonist contracts
When muscles fail to respond to signals
What is co-activation?
When only the agonist contracts
When no muscles are active
When the antagonist relaxes completely
When both agonist and antagonist contract simultaneously
During the upward phase of a biceps curl, which muscle is the agonist?
Biceps brachii
Deltoid
Triceps brachii
Brachioradialis
What type of motion involves constant speed movement around a joint?
Isotonic motion
Isometric motion
Isokinetic motion
Eccentric motion
During the downward phase of a controlled biceps curl, what type of contraction does the biceps brachii perform?
Eccentric contraction
Concentric contraction
Isometric contraction
No contraction occurs
Which muscle acts as the agonist during elbow extension?
Brachialis
Triceps brachii
Biceps brachii
Brachioradialis
What is the primary purpose of core stability muscles during limb movements?
To generate maximum power
To increase range of motion
To act as fixators and stabilize the trunk
To oppose the movement
During a biceps curl, which muscles act as assistant movers?
Triceps brachii and deltoid
Pectoralis major and latissimus dorsi
Only the biceps brachii works
Brachialis and brachioradialis
Why would co-activation be necessary during movement?
To control balance or stiffen a joint when learning a task
To generate maximum speed
To reduce energy expenditure
To prevent muscle fatigue
What happens to the triceps brachii during the upward phase of a biceps curl?
It contracts concentrically
It relaxes
It contracts eccentrically
It contracts isometrically
In plyometric exercises like box jumps, what type of contraction occurs upon landing?
Isometric contraction
No contraction
Eccentric contraction
Concentric contraction
Which of the following is an example of antagonistic muscle pairs?
Biceps and deltoid
Biceps and triceps
Quadriceps and gastrocnemius
Pectoralis and latissimus dorsi
During arm wrestling when neither person moves, what type of contraction is occurring?
Eccentric contraction
Concentric contraction
Isometric contraction
Isokinetic contraction
What happens during reciprocal inhibition?
The agonist relaxes while the antagonist contracts
The antagonist automatically relaxes when the agonist contracts
Both muscles contract with equal force
Neither muscle contracts
During a soccer kick, when do the hamstrings switch from agonist to antagonist?
During the follow-through to control leg extension
At the beginning of the kick
They never switch roles
Only during the backswing
Which type of contraction is used when slowly lowering a weight?
Eccentric contraction
Concentric contraction
Isometric contraction
Isokinetic contraction
When can reciprocal inhibition be overridden?
Only during sleep
Never, it's an automatic reflex
By the voluntary nervous system during co-activation
When muscles are fatigued
During eccentric contraction, what is the relationship between muscle force and resistance?
Muscle force is greater than resistance
Muscle force equals resistance
Muscle force is less than resistance
There is no resistance
Why would a therapist use isokinetic equipment during rehabilitation?
To maximize power output
To ensure limb speed is not excessive
To increase muscle size
To reduce muscle activation
What is the benefit of reciprocal inhibition during movement?
It reduces muscle size
It allows maximum force production without opposition from the antagonist
It slows down movement
It prevents muscle contraction
A gymnast holds a handstand position without moving. The shoulder muscles maintaining this position are performing what type of contraction, and what is their functional role?
Concentric contraction; agonists
Eccentric contraction; antagonists
Isometric contraction; fixators
Isokinetic contraction; synergists
During a vertical jump, the quadriceps first contract concentrically during takeoff, then eccentrically upon landing. What explains the muscle's ability to generate force while lengthening during landing?
The muscle maintains tension while lengthening to control the descent
The muscle relaxes completely to absorb shock
Reciprocal inhibition prevents injury
The antagonist takes over the movement
Why would an athlete learning a new complex movement pattern experience co-activation that decreases as they become more skilled?
Beginners have weaker muscles
Co-activation stiffens joints for control but becomes unnecessary with motor learning
Reciprocal inhibition is not yet developed in beginners
Skilled athletes have larger muscles
If the triceps brachii contracted concentrically during the downward phase of a biceps curl, what would be the result and why is this undesirable?
Slower, more controlled descent; this is actually desirable
The weight would be "thrown" to the floor with rapid, uncontrolled elbow extension
Better muscle development; this is actually beneficial
No change in movement pattern
During a leg extension exercise, the quadriceps act as agonists. At what point in the movement would the hamstrings potentially act as antagonists, and what type of contraction would they perform?
During the upward phase; concentric contraction
During the downward phase; eccentric contraction to control descent
Throughout the entire movement; isometric contraction
Never; the hamstrings remain relaxed throughout
In a sprint start, the hip flexors and extensors may co-activate briefly. How does this differ from reciprocal inhibition, and what is the functional advantage in this specific context?
Co-activation involves simultaneous contraction overriding reciprocal inhibition; it provides joint stability during explosive force generation
Co-activation is the same as reciprocal inhibition; there is no difference
Co-activation only occurs in the upper body; this scenario is impossible
Reciprocal inhibition is stronger during sprinting; co-activation cannot occur
What role do synergist muscles play during a biceps curl?
They lengthen to control the descent
They stabilize the joint without moving
They assist the agonist in producing movement
They oppose the movement
During a squat, which type of contraction do the quadriceps perform as you lower your body toward the ground?
Concentric contraction
Isometric contraction
Eccentric contraction
Isokinetic contraction
During running, which muscle acts as the agonist during knee flexion?
Tibialis anterior
Hamstrings
Quadriceps femoris
Gastrocnemius
Which of the following best describes the interaction between agonist and antagonist muscles during the swing phase of running?
Neither muscle is active
Both agonist and antagonist contract maximally
Agonist contracts while antagonist relaxes to allow smooth movement
Antagonist contracts and agonist relaxes
Which muscle acts as the antagonist during knee extension?
Quadriceps
Hamstrings
Gluteus maximus
Gastrocnemius
What is the function of a synergist muscle during a push-up?
It opposes the movement
It lengthens to slow the descent
It stabilizes the shoulder joint
It assists the agonist in producing movement
During a plank exercise, which type of muscle contraction is primarily occurring in the abdominal muscles?
Eccentric contraction
Concentric contraction
Isokinetic contraction
Isometric contraction
During the upward phase of a push-up, which muscle acts as the agonist at the elbow joint?
Triceps brachii
Biceps brachii
Brachioradialis
Deltoid
During the downward phase of a push-up, which muscle acts as the agonist at the elbow joint?
Deltoid
Brachioradialis
Biceps brachii
Triceps brachii
During the upward phase of a push-up, what type of contraction occurs in the pectoralis major muscle?
Eccentric contraction
Concentric contraction
Isometric contraction
Isokinetic contraction
