Muscles and Movements Quiz
Preview:
In the diagram of a motor unit, what is represented by the part labelled X?
A. Axon
B. Neuromuscular synapse
C. Nucleus
D. Dendrite
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
Which number represents myosin filament?
A. 1
B. 5
C. 3
D. 4
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
Contractile unit of a muscle which is also the functional unit of a muscle is …
A. sarcomere
B. motor unit
C. fascicle
D. myofibril
Movement to straighten a joint
A. extension
B. flexion
C. dorsiflexion
D. pronation
What is the structure that stores the Calcium in the muscle cell.
A. Sarcoplasm
B. Sarcolemma
C. Sarcoplasmic Reticulum
D. Myoglobin
Which types of movement are permitted by the elbow joint?
A. flexion and extension
B. abduction and adduction
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
Thin filaments in a myofibril are
A. Sarcomeres
B. Sarcoplasm
C. Actin
D. Myosin
What is a crossbridge?
A. Where myosin binds to actin
B. Where the calcium crosses into the cytoplasm
C. Where calcium binds with troponin
D. None of the answers are correct.
What structural component separates each sarcomere?
A. The M line
B. The Z line
C. The H Zone
D. The A Zone
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
What state is the sarcomere in #1
A. Relaxed
B. Contracting
C. Fully Contracted
D. None of the above
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