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- 1. Multiple Choice
Which myofilament makes up the THIN filaments of muscle cells?
actin
myosin
connectin
hemoglobin
- 2. Multiple Choice
The THICK filaments found in a muscle cell are called
actin
myosin
- 3. Multiple Choice
The area of interconnecting actin molecules is called the
I zone
Z line
M line
A band
- 4. Multiple Choice
The neurotransmitter that signals muscle contraction is called...
Acetylcholine
Myosin
Actin
Calcium
- 5. Multiple ChoiceRegion where a motor neuron comes in close contact with a muscle cell.neurotransmittermuscular dystrophymuscle tensionneuromuscular junction
- 6. Multiple ChoiceThe functional unit of the muscle cell is the:SarcomereOsteonMyofilamentMuscle fiber
- 7. Multiple Choice___ and ___ are regulatory proteins bound to actin.Troponin and tropomyosinMyosin and actinCalcium and OxygenGlycogen and hemoglobin
- 8. Multiple ChoiceSkeletal Muscle contraction is initiated when the ________ sends a message to the muscle cell.Muscle cellNeuronGlandNone of the above
- 9. Multiple Choice
What is the name of the protein that covers the binding sites on actin?
Myosin
Tropoblasts
Titan
Tropomyosin
- 10. Multiple ChoiceA single neuron and all the muscle fibers it stimulates make up a(n) _______.motor unitmotor neuronaxonneuromuscular junction
- 11. Multiple Choice
The end of an axon that meets a muscle fiber
synaptic knob
motor end plate
synaptic cleft
motor neural termination
- 12. Multiple Choice
The part of the sarcolemma (the muscle cell membrane) that meets a motor neuron
synaptic knob
motor end plate
synaptic cleft
motor neural termination
- 13. Multiple Choice
The space between the motor neuron and a muscle fiber at a neuromuscular junction
synaptic knob
motor end plate
synaptic cleft
motor neural termination
- 14. Multiple Choice
What is the name for the place where a motor neuron meets a muscle?
neuromuscular junction
neuropathy
myoneuroplasticity
nervous muscular tissue
- 15. Multiple Choice
Which myofibril is a large bundle of proteins with contractile heads sticking out all throughout the bundle?
Myosin
Actin
Troponin
Tropomyosin
- 16. Multiple Choice
Muscles in the eye contain motor units with a motor neuron connected to only five muscle fibers. What type of control does a person have over these muscles?
Very little control
No control
Extremely accurate control
Moderate or average control
- 17. Multiple Choice
Which myofibril is attached to the M line?
Myosin
Actin
Troponin
Tropomyosin
- 18. Multiple Choice
What type of nerve causes a muscle to contract?
motor neuron
parasympathetic neuron
interneuron
sensory neuron
- 19. Multiple Choice
The bundles of fibers found in a muscle cell are called
muscle fibers
myofibrils
myofilaments
myofascicles
- 20. Multiple Choice
What are myofibrils composed of?
muscle fibers
muscle fascicles
myofilaments
myopathic fibers
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