Motor Units, Muscle Fibres Flashcards
What is a stimulus?
An event that is received by a receptor, and perceived by nerve cells in the CNS
What do motor neurones do?
Transmit impulses as electrical signals
Where do motor neurons receive a signal from?
The central nervous system (brain, spinal chord)
Where do motor neurons pass the impulse on to?
The effector
What is a motor end plate?
It innervates with muscle fibres at the neuromuscular junction
What is the gap called at a neuromuscular junction?
Synaptic cleft
What is a motor unit?
A nerve cell and all the muscle fibres it innervates
What is action potential?
A positive charge that conducts the impulse
What are the conditions for a signal to be received at the synaptic cleft?
- There is a high enough charge
- There is enough neurotransmitter secreted into the synaptic cleft
If there is high enough charge and enough neurotransmitter, what is the impulse said to have?
Muscle action potential
Name some factors of muscle fibre type
- Neuron size
- Fibres per neuron
- Capillary density
- Mitochondrial density
- Myoglobin content
- PC stores
- Resistance to fatigue
- Recovery time
What are the recovery times for muscle fibres?
SO = 4 days - 10 days FOG = 90 seconds - 10 days FG = 90 seconds
