Mer Scott
Quiz by , created more than 1 year ago

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.

12
1
0
Mer Scott
Created by Mer Scott about 7 years ago
Close

L12 Muscle Actions and Roles

Question 1 of 14

1

Which of these is not a structure of myocytes?

Select one of the following:

  • T-tubes

  • Sarcolemma

  • Sarcoplasmic reticulum

  • Lacunae

Explanation

Question 2 of 14

1

The perimysium wraps around a myocyte.

Select one of the following:

  • True
  • False

Explanation

Question 3 of 14

1

A nerve cells innervates from the distal end of a muscle so as to innervate the entire area of the muscle.

Select one of the following:

  • True
  • False

Explanation

Question 4 of 14

1

Choose the correct statements about the NMJ.

Select one or more of the following:

  • 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.

Explanation

Question 5 of 14

1

and allow the myosin and actin to interdigitate without losing any of their .

Drag and drop to complete the text.

    Ca++
    Na+
    ATP
    K+
    microfilaments
    myofilaments
    length
    ionic mass

Explanation

Question 6 of 14

1

Choose the correct components of the motor unit:

Select one of the following:

  • Motor neuron and the muscle it innervates

  • Motor neuron

  • Motor neuron, and all the muscles it innervates

Explanation

Question 7 of 14

1

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

Select one of the following:

  • True
  • False

Explanation

Question 8 of 14

1

Muscle fibres display no intermediate activation, it is all or none.

Select one of the following:

  • True
  • False

Explanation

Question 9 of 14

1

Which of these does not effect force of contraction?

Select one of the following:

  • Size of motor units

  • Number of motor units

  • Rate of firing

  • Neurotransmitter used

Explanation

Question 10 of 14

1

Bones act as levers which can primarily...
(Choose all correct.)

Select one or more of the following:

  • stabilise a joint position

  • overcome loads

  • allow a large range of motion and give speed to movement

  • prevent stress on bone

Explanation

Question 11 of 14

1

A student lifts a textbook. Which action is this?

Select one of the following:

  • Concentric

  • Isometric

  • Eccentric

Explanation

Question 12 of 14

1

Which statement best describes isometric muscle action.

Select one of the following:

  • 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.

Explanation

Question 13 of 14

1

If a muscle is active, developing tension, and lengthening, it is:

Select one or more of the following:

  • Eccentric

  • Concentric

  • Isometric

Explanation

Question 14 of 14

1

You stand with your weight on your left leg. What muscle role is the quadriceps taking?

Select one of the following:

  • Agonist

  • Neutraliser

  • Antagonist

  • Stabiliser

Explanation

Previous
Next