Flashcards in 1.3 Neuromuscular Systems Deck (21)
What are the three main types of muscle fibres?
Type 1 (slow oxidative SO)
Type IIa (fast oxidative glycolytic FOG)
Type IIb (IIx) (fast glycolytic FG)
What are some characteristic of Type 1 Slow Oxidative Twitch Fibres?
- Slow Twitch
- Resistant to fatigue
- Low force produced
- Produce energy aerobically
What are some characteristics of Type IIa Fast Oxidative Glycolytic Twitch Fibres?
- Fast Oxidative
- Pink / Light Red
- More prone to fatigue
- Medium force produced
- Larger burst of energy is needed
What are some characteristics of Type IIb (IIx) Fast Glycolytic Twitch Fibres?
- Fast Glycolytic
- Rapid fatigue
- Highly explosive events
- Short burst of energy is needed
Name a sporting example where Type 1 twitch fibres will benefit the performer?
Name a sporting example where Type IIa twitch fibres will benefit the performer?
Athletic events (400m, 800m, 1500m)
Name a sporting example where Type IIb (IIx) twitch fibres will benefit the performer?
Athletic events (100m)
Literally means ‘with oxygen’ so it refers to exercise that is low to medium intensity where the oxygen demand for muscles can be met.
Means ‘without oxygen’ and refers to exercise at high intensity such as sprinting, where the demand for oxygen by the muscles is so high that he cannot be met.
Hypertrophy is where the muscle has become bigger and stronger?
Explain a motor unit?
A motor neurone and it’s muscle fibres. Only one type of muscle fibre can be found in one particular motor unit. Muscle fibres work with the nervous system so that a contraction can occur. The motor neurone transmits the nerve impulse to the muscle fibre. Each motor neurone has branches that end in the neuromuscular junction on the muscle fibre.
Fine motor neurones?
Nerve cells which transmit the brain is instructions as electrical impulses to the muscles.
Define neuromuscular junction?
Where the motor neuron and the muscle fibre meet.
Explain that all or none law?
Where a sequence of impulses has to be a sufficient intensity to stimulate all of the muscle fibres in a motor unit in order for them to contract. If not, none of them contract.
Define wave summation?
Where there is a repeated nerve impulse with no time to relax so a smooth, sustained contraction occurs, rather than twitches.
Define tetanic contraction?
A sustained muscle contraction caused by a series of fast repeating stimuli.
Define Spatial summation?
Where the strength of a contraction changes by altering the number and size of the muscles motor units.
Define muscle spindles?
These detect how far and how fast a muscle has been stretched and produce the stretch reflex.
Define Golgi tendon organs?
These are activated when there is tension in a muscle.
Define isometric contraction?
Where there is tension in a muscle but no visible movement.