8737742
Descrição
Questão 1
Questão
Which of these is not a structure of myocytes?
Responda
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T-tubes
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Sarcolemma
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Sarcoplasmic reticulum
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Lacunae
Questão 2
Questão
The perimysium wraps around a myocyte.
Responda
- True
- False
Questão 3
Questão
A nerve cells innervates from the distal end of a muscle so as to innervate the entire area of the muscle.
Responda
- True
- False
Questão 4
Questão
Choose the correct statements about the NMJ.
Responda
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The axon coming to the NMJ is commonly unmyelinated.
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The NMJ can have multiple motor end plates.
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The synaptic cleft utilises chemical transmission methods.
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A NMJ endplate always situates beside the nucleus of the myocite.
Questão 5
Questão
[blank_start]Ca++[blank_end] and [blank_start]ATP[blank_end] allow the myosin and actin [blank_start]microfilaments[blank_end] to interdigitate without losing any of their [blank_start]length[blank_end].
Responda
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Ca++
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Na+
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ATP
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K+
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microfilaments
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myofilaments
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length
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ionic mass
Questão 6
Questão
Choose the correct components of the motor unit:
Responda
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Motor neuron and the muscle it innervates
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Motor neuron
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Motor neuron, and all the muscles it innervates
Questão 7
Questão
Myasthenia gravis is a neuromuscular disease which blocks the ACh receptors, meaning signals from the motor neuron do not reach the NMJ and muscle.
Responda
- True
- False
Questão 8
Questão
Muscle fibres display no intermediate activation, it is all or none.
Responda
- True
- False
Questão 9
Questão
Which of these does not effect force of contraction?
Responda
-
Size of motor units
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Number of motor units
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Rate of firing
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Neurotransmitter used
Questão 10
Questão
Bones act as levers which can primarily...
(Choose all correct.)
Responda
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stabilise a joint position
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overcome loads
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allow a large range of motion and give speed to movement
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prevent stress on bone
Questão 11
Questão
A student lifts a textbook. Which action is this?
Responda
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Concentric
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Isometric
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Eccentric
Questão 12
Questão
Which statement best describes isometric muscle action.
Responda
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The muscle is active and develops tension, but does not move.
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The muscle is active and develops tension, keeping a constant length and constant joint position.
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The muscle is inactive but developing tension, keeping a constant length and constant joint position.
Questão 13
Questão
If a muscle is active, developing tension, and lengthening, it is:
Responda
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Eccentric
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Concentric
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Isometric
Questão 14
Questão
You stand with your weight on your left leg. What muscle role is the quadriceps taking?
Responda
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Agonist
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Neutraliser
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Antagonist
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Stabiliser
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