8737742
Descripción
Pregunta 1
Pregunta
Which of these is not a structure of myocytes?
Respuesta
-
T-tubes
-
Sarcolemma
-
Sarcoplasmic reticulum
-
Lacunae
Pregunta 2
Pregunta
The perimysium wraps around a myocyte.
Respuesta
- True
- False
Pregunta 3
Pregunta
A nerve cells innervates from the distal end of a muscle so as to innervate the entire area of the muscle.
Respuesta
- True
- False
Pregunta 4
Pregunta
Choose the correct statements about the NMJ.
Respuesta
-
The axon coming to the NMJ is commonly unmyelinated.
-
The NMJ can have multiple motor end plates.
-
The synaptic cleft utilises chemical transmission methods.
-
A NMJ endplate always situates beside the nucleus of the myocite.
Pregunta 5
Pregunta
[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].
Respuesta
-
Ca++
-
Na+
-
ATP
-
K+
-
microfilaments
-
myofilaments
-
length
-
ionic mass
Pregunta 6
Pregunta
Choose the correct components of the motor unit:
Respuesta
-
Motor neuron and the muscle it innervates
-
Motor neuron
-
Motor neuron, and all the muscles it innervates
Pregunta 7
Pregunta
Myasthenia gravis is a neuromuscular disease which blocks the ACh receptors, meaning signals from the motor neuron do not reach the NMJ and muscle.
Respuesta
- True
- False
Pregunta 8
Pregunta
Muscle fibres display no intermediate activation, it is all or none.
Respuesta
- True
- False
Pregunta 9
Pregunta
Which of these does not effect force of contraction?
Respuesta
-
Size of motor units
-
Number of motor units
-
Rate of firing
-
Neurotransmitter used
Pregunta 10
Pregunta
Bones act as levers which can primarily...
(Choose all correct.)
Respuesta
-
stabilise a joint position
-
overcome loads
-
allow a large range of motion and give speed to movement
-
prevent stress on bone
Pregunta 11
Pregunta
A student lifts a textbook. Which action is this?
Respuesta
-
Concentric
-
Isometric
-
Eccentric
Pregunta 12
Pregunta
Which statement best describes isometric muscle action.
Respuesta
-
The muscle is active and develops tension, but does not move.
-
The muscle is active and develops tension, keeping a constant length and constant joint position.
-
The muscle is inactive but developing tension, keeping a constant length and constant joint position.
Pregunta 13
Pregunta
If a muscle is active, developing tension, and lengthening, it is:
Respuesta
-
Eccentric
-
Concentric
-
Isometric
Pregunta 14
Pregunta
You stand with your weight on your left leg. What muscle role is the quadriceps taking?
Respuesta
-
Agonist
-
Neutraliser
-
Antagonist
-
Stabiliser
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