Matthew Coulson
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Physiology 5 – Motor units, muscle spindles, Golgi tendon organs and joint receptors given on 5/9/2018

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Matthew Coulson
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Physiology V: Motor Units, Muscle Spindles, Golgi Tendon Organs and Joint Receptors

Question 1 of 15

1

When do motor neurons switch from being upper motor neurons to lower motor neurons?

Select one of the following:

  • As they pass the C1 vertebrae

  • At the Dorsal Horn of the spinal cord

  • At the Ventral Horn of the spinal cord

Explanation

Question 2 of 15

1

Which type of motor neurons innervate the bulk of fibres within a muscle responsible for contractile force?

Select one of the following:

  • Alpha Motor Neurons

  • Delta Motor Neurons

  • Gamma Motor Neurons

Explanation

Question 3 of 15

1

Which type of motor neuron innervates a sensory organ within the muscle responsible for reacting to muscle stretch?

Select one of the following:

  • Alpha Motor Neuron

  • Delta Motor Neuron

  • Gamma Motor Neuron

Explanation

Question 4 of 15

1

Fill the blank space to complete the text.

The sensory organ within a muscle that detects changes to muscle length and responds to stretch is called the muscle

Explanation

Question 5 of 15

1

Muscles that work together to perform a function are called ...
E.g. Biceps brachii and brachialis working together to perform flexion of the forearm

Select one of the following:

  • Synergistic Muscles

  • Synchronous Muscles

  • Synovial Muscles

Explanation

Question 6 of 15

1

Fill the blank space to complete the text.

An α-motor neuron and all of the skeletal muscle fibres that it innervates are collectively known as a

Explanation

Question 7 of 15

1

Fill the blank space to complete the text.

The collection of α-motor neurons that innervate a muscle is called a motor neuron

Explanation

Question 8 of 15

1

Fill the blank space to complete the text.

A single action potential in an α-motor neuron causes a muscle fibre to ''

Explanation

Question 9 of 15

1

Fill the blank space to complete the text.

Sustained contraction of a muscle due to action potentials being fired at a very high rate is known as

Explanation

Question 10 of 15

1

Match the skeletal muscle fibre type to its description:
: ATP derived from oxidative phosphorylation. Slow contraction and relaxation. Fatigue Resistant.
: ATP derived from oxidative phosphorylation. Fast contraction and relaxation. Fatigue Resistant.
: ATP derived from glycolysis. Rapid contraction but not fatigue resistant.

Drag and drop to complete the text.

    Type I Skeletal Muscle Fibre
    Type IIa Skeletal Muscle Fibre
    Type IIb Skeletal Muscle Fibre

Explanation

Question 11 of 15

1

Of the different types of skeletal muscle fibres, which is pale/white in colour

Select one of the following:

  • Type I

  • Type IIa

  • Type IIb

Explanation

Question 12 of 15

1

Fill the blank space to complete the text.

When a skeletal muscle is pulled, the muscle spindles inside that muscle react causing the muscle to resist stretch by pulling back. This is called the reflex.

Explanation

Question 13 of 15

1

Select from the dropdown lists to complete the text.

( Intrafusal, Extrafusal, Parafusal ) skeletal muscle fibres are found in the muscle spindle and are innervated by ( gamma, alpha, delta ) motor neurons

Explanation

Question 14 of 15

1

Fill the blank space to complete the text.

At the junction of muscle and tendon, in series with extrafusal fibres, lie small 'organs' which monitor changes in muscle tension. These small 'organs' are called Organs

Explanation

Question 15 of 15

1

What is the function of Golgi Tendon Organs?

Select one of the following:

  • To assist and amplify the myotatic reflex

  • To bring about muscle relaxation in response to extreme muscle tension

  • To send 'help' signals to synergistic muscles in times of extreme muscle tension

Explanation

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