Muscles and Movements Quiz
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Contractile unit of a muscle which is also the functional unit of a muscle is …
A. sarcomere
B. motor unit
C. fascicle
D. myofibril
The organelle that contains actin and myosin.
A. Tendon
B. myofilament
C. myofibril
D. Fiber
Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.
A. Muscle cell
B. Neuron
C. Gland
D. None of the above
Which of the following statements is true about the sliding filament theory?
A. During contraction the H zone remains the same length
B. A cross-bridge is formed by troponin and tropomysin attaching to one another
C. A nerve impulse causes an action potential to spread across the muscle
D. ATP is released around the filaments, stimulating the muscle to contract
What is the name of the gap between two neurons?
A. Synapse
B. Dendrite
C. Axon
D. Cell body
In the diagram of a motor unit, what is represented by the part labelled X?
A. Axon
B. Neuromuscular synapse
C. Nucleus
D. Dendrite
What is the neurotransmitter involved in stimulating muscle contraction?
A. Tropomysosin
B. Acetylcholine
C. Calcium ions
D. Pyruvate
What is the structure that stores the Calcium in the muscle cell.
A. Sarcoplasm
B. Sarcolemma
C. Sarcoplasmic Reticulum
D. Myoglobin
Movement of the hand/foot so that the thumb/big toe moves toward the midline
A. inversion
B. eversion
C. adduction
D. abduction
Which types of movement are permitted by the hip joint?
A. flexion and extension
B. adduction and abduction
C. rotation
D. all the above
Movement of hand/foot so that the thumb/big toe moves away from the midline
A. inversion
B. eversion
C. adduction
D. abduction
What state is the sarcomere in #1
A. Relaxed
B. Contracting
C. Fully Contracted
D. None of the above
What is cholinesterase?
A. It’s an enzyme
B. It’s a mineral
C. It’s a muscle type
D. It’s neurotransmitter
Movement to straighten a joint
A. extension
B. flexion
C. dorsiflexion
D. pronation
Calcium:
A. causes ATP binding to actin
B. increases the action potential along the sarcolemma
C. binds to proteins on myosin
D. triggers the binding of myosin to actin
What structural component separates each sarcomere?
A. The M line
B. The Z line
C. The H Zone
D. The A Zone
When actin is pulled past the myosin filament the..
A. Sarcomere shortens
B. Muscle shortens
C. Z line shortens
D. All of the above
What two chemicals are necessary for muscle contraction to occur?
A. Niacin and Potassium
B. Calcium and ATP
C. Sodium and Potassium
D. Ach and Potassium
Region where a motor neuron comes in close contact with a muscle cell.
A. neurotransmitter
B. muscular dystrophy
C. muscle tension
D. neuromuscular junction
___ and ___ are regulatory proteins bound to actin.
A. Troponin and tropomyosin
B. Myosin and actin
C. Calcium and Oxygen
D. Glycogen and hemoglobin
Movement to bend a joint
A. extension
B. circumduction
C. eversion
D. flexion
Which number represents myosin filament?
A. 1
B. 5
C. 3
D. 4
Which types of movement are permitted by the elbow joint?
A. flexion and extension
B. abduction and adduction
C. rotation
D. all the above
When a muscle contracts
A. both actin and myosin become shorter in length
B. myosin heads pull the actin towards the M line
C. actin heads pull myosin towards H line
D. the sarcomere length increases
Movement of the arm/leg away from the midline
A. adduction
B. eversion
C. inversion
D. abduction
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