The neuromuscular system 1.3

Question 1

What are the 3 types of muscle fibres

Answer 1

• slow oxidative
• fast oxidative glycolytic
• fast glycolytic

Question 2

What is the slow oxidative muscle fibre also known as

Answer 2

type 1

Question 3

What is the fast oxidative glycolytic muscle fibre also known as

Answer 3

type 2a

Question 4

What is the fast glycolytic muscle fibre also known as

Answer 4

type 2x

Question 5

What determines your type of muscle fibre

Answer 5

Genetics

Question 6

What muscle fibre type do postural muscles tend to have

Answer 6

Slow twitch

Question 7

Why do postural muscles tend to have slow twitch muscle fibres

Answer 7

they need to maintain the body position over a long period of time

Question 8

What are the 2 types of fast twitch muscle fibres

Answer 8

• Type 2a

- Type 2x

Question 9

What is the contraction speed for type 1

Answer 9

slow (110)

Question 10

What is the contraction speed for type 2a

Answer 10

Fast (50)

Question 11

What is the contraction speed for type 2x

Answer 11

Fast (50)

Question 12

What is the motor neuron size for type 1

Answer 12

small

Question 13

What is the motor neuron size for type 2a

Answer 13

large

Question 14

What is the motor neuron size for type 2x

Answer 14

large

Question 15

What is the motor neurone conduction capacity for type 1

Answer 15

slow

Question 16

What is the motor neurone conduction capacity for type 2a

Answer 16

fast

Question 17

What is the motor neurone conduction capacity for type 2x

Answer 17

fast

Question 18

What is the force produced for type 1

Answer 18

low

Question 19

What is the force produced for type 2a

Answer 19

high

Question 20

What is the force produced for type 2x

Answer 20

high

Question 21

What is the fatigability for type 1

Answer 21

low

Question 22

What is the fatigability for type 2a

Answer 22

medium

Question 23

What is the fatigability for type 2x

Answer 23

high

Question 24

What is the mitochondrial density for type 1

Answer 24

high

Question 25

What is the mitochondrial density for type 2a

Answer 25

medium

Question 26

What is the mitochondrial density for type 2x

Answer 26

low

Question 27

What is the myoglobin content for type 1

Answer 27

high

Question 28

What is the myoglobin content for type 2a

Answer 28

medium

Question 29

What is the myoglobin content for type 2x

Answer 29

low

Question 30

what is the capillary density for type 1

Answer 30

high

Question 31

what is the capillary density for type 2a

Answer 31

medium

Question 32

what is the capillary density for type 2x

Answer 32

low

Question 33

What is the aerobic capacity for type 1

Answer 33

very high

Question 34

What is the aerobic capacity for type 2a

Answer 34

medium

Question 35

What is the aerobic capacity for type 2x

Answer 35

low

Question 36

What is the anaerobic capacity for type 1

Answer 36

low

Question 37

What is the anaerobic capacity for type 2a

Answer 37

high

Question 38

What is the anaerobic capacity for type 2x

Answer 38

very high

Question 39

What is the myosin ATPase/ glycolytic enzyme activity for type 1

Answer 39

low

Question 40

What is the myosin ATPase/ glycolytic enzyme activity for type 2a

Answer 40

high

Question 41

What is the myosin ATPase/ glycolytic enzyme activity for type 2x

Answer 41

very high

Question 42

What are muscle fibres grouped into

Answer 42

motor units

Question 43

What does a motor unit consist of

Answer 43

Motor neurone and its muscle fibres

Question 44

Can a motor unit have different types of muscle fibres

Answer 44

No they're all the same

Question 45

What do the muscle fibres work with to perform a contraction

Answer 45

Nervous system

Question 46

What does the motor neurone transmit and where to

Answer 46

nerve impulse to the muscle fibres

Question 47

What is the neuromuscular junction

Answer 47

Where the motor neurone and the muscle fibre meet

Question 48

What does each motor neurone have at its end

Answer 48

A neuromuscular junction`

Question 49

Will the muscles controlling eye movements have small or large motor units

Answer 49

small

Question 50

What is the all or none law

Answer 50

When the motor neurone stimulates the muscle fibre either all of them contract or none of them contract

Question 51

What is the minimum amount of stimulation required to start a contraction called

Answer 51

The threshold

Question 52

What happens if the sequence of impulses is equal to or more than the threshold

Answer 52

The muscle fibres in the motor unit will contract

Question 53

What happens if the sequence of impulses are less than the threshold

Answer 53

no muscle action will occur

Question 54

Can a motor unit have a fast twitch and slow twitch muscle fibre

Answer 54

No it has to be the same muscle fibre type

Question 55

For jogging, long-distance swimming what motor unit type will the brain recruit

Answer 55

Slow twitch motor unit

Question 56

For a greater contraction force like sprinting or power lifting what motor unit type will the brain recruit

Answer 56

Fast twitch motor units

Question 57

What is wave summation

Answer 57

Repeated activation of a motor neurone stimulating a given muscle fibre results in a greater force of contraction

Question 58

What is released each time a nerve impulse reaches a muscle cell

Answer 58

Calcium

Question 59

What needs to be present for muscles to contract

Answer 59

Calcium

Question 60

What is a tetanic contraction

Answer 60

Repeated nerve impulse leaving the muscles no time to relax causing calcium to build up producing a contraction

Question 61

How is the muscle contraction described in a tetanic contraction

Answer 61

Forceful, sustained, and smooth contraction

Question 62

What is spatial cummation

Answer 62

Impulses are received at the same time at different places on the neurone which add up to fire the neurone

Question 63

What size motor units does spatial summation activate

Answer 63

additional and bigger motor units within a muscle to develop more force