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WorksheetsUnit 4-Muscle System-Part 2-Muscle Contraction-Gen Anat
Total questions: 26
Worksheet time: 13mins
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 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
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)
The functional unit of the muscle cell is the:
Sarcomere
Myofilament
Osteon
Muscle fiber
Rigor mortis occur because
Lack of calcium ions attach to tropomyosin
Lack of ATP attach to the myosin head
Muscle stiff due to lack of heat
Lactic acid accumulates in muscle
Power stroke will occur when
ATP binds to myosin head
Myosin head releases ADP and Pi
Myosin head hydrolyse ATP
Myosin binds to actin
Which of the following refers to the muscle cell?
Myofibril
Myofilament
Fascicle
Muscle fiber
Ca2+ will be released from the sarcoplasmic reticulum when
impulse reaches neuromuscular junction
impulse transmitted along T tubule
ATP binds to sarcoplasmic reticulum
acetyl choline binds to ligand gated ion channels
The point at which the nerve cell reaches the sarcolemma of the muscle fiber is the _____.
Neurotransmitter
Acetylcholine
Synaptic cleft
Neuromuscular Junction
One neuron and all the skeletal muscle cells it stimulates is the ____ ___.
Neurotransmitter
Neuromuscular junction
Motor unit
Synaptic cleft
The gap between the nerve cell and sarcolemma is the ____ ___.
Synaptic cleft
Neurotransmitter
Motor unit
Neuromuscular junction
What is the name of the component that houses the neurotransmitters?
Synaptic cleft
Acetylcholine
Receptors
Synaptic vesicles
Once ACh binds to receptor cells on the sarcolemma, what takes place?
Sarcolemma becomes temporarily permeable to sodium.
The muscle contracts.
Calcium is pumped into the axon terminal.
Synaptic vesicles move to the end of the terminal.
Structure #1 is the ____________
Synaptic vesicle
Axon of motor neuron
Mitochondrion
Sarcolemma
Structure #3 is the ____________
Synaptic vesicle
Axon of motor neuron
Mitochondrion
Sarcolemma
Structure #5 is the ____________
Synaptic vesicle
Myofibrils
Mitochondrion
Sarcolemma
Structure #2 is the ____________
Synaptic vesicle
Myofibrils
Neuromuscular junction
Synaptic cleft
