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L12 Muscle Actions and Roles

Description

Objectives: • Describe a motor unit and how it is involved in skeletal muscle contraction. • Describe the attachments of muscles and how this affects muscle action. • Define the actions of muscles. • Describe the roles a muscle can play. • Understand that the same muscle can have different actions and roles.
Mer Scott
Quiz by Mer Scott, updated more than 1 year ago
Mer Scott
Created by Mer Scott about 7 years ago
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Resource summary

Question 1

Question
Which of these is not a structure of myocytes?
Answer
  • T-tubes
  • Sarcolemma
  • Sarcoplasmic reticulum
  • Lacunae

Question 2

Question
The perimysium wraps around a myocyte.
Answer
  • True
  • False

Question 3

Question
A nerve cells innervates from the distal end of a muscle so as to innervate the entire area of the muscle.
Answer
  • True
  • False

Question 4

Question
Choose the correct statements about the NMJ.
Answer
  • 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.

Question 5

Question
[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].
Answer
  • Ca++
  • Na+
  • ATP
  • K+
  • microfilaments
  • myofilaments
  • length
  • ionic mass

Question 6

Question
Choose the correct components of the motor unit:
Answer
  • Motor neuron and the muscle it innervates
  • Motor neuron
  • Motor neuron, and all the muscles it innervates

Question 7

Question
Myasthenia gravis is a neuromuscular disease which blocks the ACh receptors, meaning signals from the motor neuron do not reach the NMJ and muscle.
Answer
  • True
  • False

Question 8

Question
Muscle fibres display no intermediate activation, it is all or none.
Answer
  • True
  • False

Question 9

Question
Which of these does not effect force of contraction?
Answer
  • Size of motor units
  • Number of motor units
  • Rate of firing
  • Neurotransmitter used

Question 10

Question
Bones act as levers which can primarily... (Choose all correct.)
Answer
  • stabilise a joint position
  • overcome loads
  • allow a large range of motion and give speed to movement
  • prevent stress on bone

Question 11

Question
A student lifts a textbook. Which action is this?
Answer
  • Concentric
  • Isometric
  • Eccentric

Question 12

Question
Which statement best describes isometric muscle action.
Answer
  • 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.

Question 13

Question
If a muscle is active, developing tension, and lengthening, it is:
Answer
  • Eccentric
  • Concentric
  • Isometric

Question 14

Question
You stand with your weight on your left leg. What muscle role is the quadriceps taking?
Answer
  • Agonist
  • Neutraliser
  • Antagonist
  • Stabiliser
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