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A-Level PE Anatomy And Physiology > Motor Neurons > Flashcards

Flashcards in Motor Neurons Deck (16)
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1

What happens when there is a large stimulus from the CNS

A large stimulus from the CNS recruits a large number of motor units providing a greater force of contraction

2

What are the three types of motor units

Type 1
Type 2a
Type 2b

3

Describe type one motor units (2 things)

1. Small
2. Produce low force of contractions over a long period of time

4

Describe type 2a motor units

The force and duration of contractions is between that of type 1 and type 2a motor units

5

Describe type 2b motor units (2 things)

1. Large
2. Produce the greatest force over a short period of time

6

In what order are motor units recruited

Firstly type 1a, then type 2a and then type 2b

7

What is a neurone

A nerve cell

8

What is an axon

An axon carries an electrical impulse down the neurone to the neuromuscular junction

9

What is the neuromuscular junction

The neuromuscular junction is where the motor neurone interacts with muscle fibres across a synapse

10

What is a synapse

A synapse is the space between the moron neurone and the muscle

11

What is the motor end plate

The motor end plate is an area of muscle that establishes synaptic contact with the neuromuscular junction

12

What is resting potential

Resting potential is where there is the neurone at rest and there is a lower charge inside the neurone than outside the neurone

13

What is action potential

Action potential is the electrical energy that is carried down the axon

14

What is the neurotransmitter that is transmitted from the neuromuscular junction across the synapse

Acetyl choline

15

What is the all or none law

The all or none law states that the action potential threshold must be reached for all the fibres in that motor neurone to contract and if it’s not reached then none of the fibres in that motor neurone will contract

16

Define a motor unit

A motor unit is a motor neurone plus all the muscle fibres it innervates

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