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WorksheetsMuscle Unit Test Review
Total questions: 25
Worksheet time: 13mins
Which thin filament protein bind to Ca during muscle contraction?
Actin
Myosin
Troponin
Tropomyosin
Click all that apply. Which of these make up a motor unit?
Motor neuron
Motor fiber
Muscle
Nerve
The staircase phenomenon: increased muscle contraction, increased strength over time
Treppe
Tetanus
Muscle Energy
Metabolism
Which muscle contraction results from a high amount of Ca still remaining in the muscle
Treppe
Tetanus
Muscle Energy
Metabolism
Which muscle characteristic allows the muscle to return to resting length after contraction?
Contractility
Excitability
Extensibility
Tension
What is the contractile unit of the muscle?
Z disk
Sarcomere
Muscle fiber
Muscle cell
What protein makes up the thick filaments?
Troponin
Tropomyosin
Myosin
Actin
What part of the muscle fiber stores Ca ions and releases them when stimulated?
T tubule
Sarcolemma
Nucleus
Sarcoplasmic reticulum
What is the name of the neurotransmitter that is released from the neuron to the sarcolemma?
Acetylcholine
Acetone
ATP
Calcium
Which of these occurs last during a muscle contraction?
The nerve signal reaches the neuromuscular junction
Ach is released and opens Na ion channels
The sarcomere shortens
The myosin binds to the actin
Which of these occurs first during a muscle contraction?
The nerve signal reaches the neuromuscular junction
Ach is released and opens Na ion channels
The sarcomere shortens
The myosin binds to the actin
The green arrows are pointing at the border between sarcomeres called the.....
M Line
H Line
Z disk
I Line
Identify letter 'G'
Sarcolemma
Sarcoplasmic Reticulum
T-tubules
Mitochondria
Identify letter 'H'
Sarcolemma
Sarcoplasmic Reticulum
T-tubules
Mitochondria
Identify letter 'D'
Z disk
Thick Filament
Thin Filament
Endoplasmic reticulum
Identify letter 'E'
Z disk
Thick Filament
Thin Filament
Endoplasmic reticulum
Identify letter 'F'
Sarcolemma
Sarcomere
Myofibril
Sarcoplasmic reticulum
Identify letter 'B'
Sarcolemma
Sarcomere
Myofibril
Sarcoplasmic reticulum
In this image of a myofibril, what does 'D' represent
Z disk
Thin filament
Thick filament
1 Sarcomere
The molecule that Ca binds to prior to cross-bridge formation
Troponin
Tropomyosin
Actin
Myosin
Covers the binding sites preventing actin from binding with myosin heads
Troponin
Tropomyosin
Actin
Myosin
What type of muscle contraction does this graph represent?
Tetanus
Treppe
What happens to the levels of calcium in this type of contraction?
Remains high, so muscle continues to contract
Calcium is released from SR, some retreat back during relaxation, but not all
Calcium is used up completely
There is no calcium used in this contraction
What type of muscle contraction does this graph represent?
Tetanus
Treppe
Describe the nerve stimuli in this type of contraction
Rapid succession with no time for muscle to relax
Less stimuli, but muscle will contract more strongly after a few times
