WorksheetsMuscle contraction
Total questions: 18
Worksheet time: 9mins
What is necessary for the myosin to release the actin?
ATP
Calcium
ADP
Sodium
What does the myosin do to the actin?
Nothing
Pushes on it
Pulls on it
Breaks it into pieces
What is a crossbridge?
Where myosin binds to actin
Where the calcium crosses into the cytoplasm
Where calcium binds with troponin
Where titin and myosin are connected
What does calcium do to the actin?
Covers myosin binding sites
Uncovers myosin binding sites
Covers actin binding sites
Uncovers actin binding sites
What is the name of the protein that covers the binding sites on actin?
Myosin
Titin
Troponin
Tropomyosin
What does the sarcoplasmic reticulum do?
Stores sodium
Stores ATP
Releases sodium
Stores calcium
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 by the actin
The actin is pulled 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
When a muscle is relaxed and in a lengthened 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
What two chemicals are necessary for muscle contraction to occur?
Niacin and Potassium
Calcium and ATP
Sodium and Potassium
Acetylcholine and Potassium
___ and ___ are regulatory proteins bound to actin.
Myosin and actin
Glycogen and hemoglobin
Calcium and oxygen
Troponin and tropomyosin
Skeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.
Muscle cell
Gland
Neuron
None of the above
What is the structure that stores calcium in the muscle cell?
Sarcoplasmic reticulum
Myoglobin
Neuron
Neuromuscular junction
The neurotransmitter that signals muscle contraction is...
Calcium
Actin
Myosin
Ach (acetylcholine)
The functional unit of the muscle cell is the:
Sarcomere
Myofilament
Osteon
Muscle fiber
What is the name of structure #1?
Troponin
Tropomyosin
Actin
ATP
What is the name of structure #2?
Troponin
Tropomyosin
Actin
ATP
