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WorksheetsAnatomy: Muscle Contraction and Fatigue
Total questions: 11
Worksheet time: 6mins
Rigor mortis occur because
Lack of calcium ions attach to tropomyosin
Lack of ATP to cause the myosin head to release
Muscle stiff due to lack of heat
Lactic acid accumulates in muscle
Which of the following refers to the muscle cell?
Myofibril
Myofilament
Fascicle
Muscle fiber
Which ion below is NOT critical to muscle contraction?
Sodium Ion
Calcium Ion
Phosphorus Ion
What role does calcium play in muscle contraction?
Covers action binding sites
Uncovers actin binding sites
Covers myosin binding sites
Uncovers myosin binding sites
What is the name of the place where a nerve meets a muscle fiber
Nerve junction
Neuromuscular junction
Muscle junction
Crossbridge
How does the sarcomere shorten (contract) ?
The myosin filaments contract
The actin filaments contract
The myosin is pulled closer by the actin
The actin is pulled closer by the myosin
When a muscle is in a contracted position, what is the relationship between actin filaments?
They are on top of one another
They are beside each other
They are close to each other
They are far apart from each other
Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.
Muscle cell
Gland
Neuron
None of the above
The neurotransmitter that signals muscle contraction is...
Calcium
Actin
Myosin
Ach (acetylcholine)
This disease can cause your muscles to stop contracting.
Tetanus
Botulism
Myasthenia gravis
Rotator cuff tear
Muscle fatigue is due in part to the accumulation of:
lactic acid
ATP
carbon dioxide
pyruvic acid
