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WorksheetsMusculatory System
Total questions: 10
Worksheet time: 5mins
Which ions bind to troponin to move tropomyosin to reveal the myosin-binding sites on the actin thin filament?
Sodium ions
Calcium ions
Potassium ions
Magnesium
Muscle contraction involves multiple specialized proteins and energy expenditure. Which of the following statements best summarizes a muscle contraction?
Troponin slides along myosin by utilizing energy from ATP
Myosin slides along actin by utilizing energy from ATP
Tropomyosin attaches to myosin and utilizes energy from calcium ions
Calcium ions bind to receptors on actin, causing muscle contraction to occur
How would hypocalcemia, or calcium-deficiency disease. affect the proteins responsible for muscle contraction?
Tropomyosin production will be limited, inhibiting the binding of myosin to actin.
Myosin will be unable to bind to actin because troponin holds tropomyosin into place on actin.
Myosin will be unable to bind to ATP.
Troponin production will be limited inhibiting the binding of myosin and actin.
Which area of the sarcomere contains both actin and myosin filaments?
The I-band
The H-Band + I-Band
The H-band
The A-Band
Analysis of a video of a sarcomere reveals the Z-lines to be moving closer together. Which of the following is occurring?
The actin fibers are moving closer together, relaxing the muscle
The actin fibers are moving farther apart, relaxing the muscle
The actin fibers are moving closer together, contracting the muscle
The actin fibers are moving farther apart, contracting the muscle
Consider the image. Which letter(s) in the diagram of a muscle shown refer(s) to an individual muscle cell?
letter c only
letters c, e, f, and i
letter e only
letters f and i
letter i only
Which option represents bone-forming cells?
lacunae
osteoblasts
osteoclasts
chondroblasts
The basic contractile unit of a muscle is called the:
. . . . .
sarcomere
muscle fiber
thick filament
Z disc
myofibril
During _____ bone segments move closer together, whereas during ______ bone segments move further apart.
flexion;extension
extension;flexion
rotation;flexion
flexion;rotation
A single motor neuron and the population of muscle fibers that it innervates is called a(n):
. . . . .
motor endplate
motor unit
neuromuscular junction
excitation-contraction coupling
