Stimulus for contraction 1 Flashcards
1
Q
What is the neurotransmitter for skeletal muscle fibre contraction?
A
Acetylcholine
2
Q
Where is acetylcholine produced?
A
in the motor neuron
3
Q
When is acetylcholine released into the synaptic cleft?
A
In response to an impulse in the motor neuron: it then stimulates the muscle fibre
4
Q
What happens after muscle impulse?
A
The sarcoplasmic reticulum releases its stored calcium to the cytosol of the muscle fibre
5
Q
What does the high Ca in the sarcoplasm interact with?
A
troponin and tropomyosin molecules
Exposing the myosin binding sites on the actin filaments
6
Q
What happens after exposing the myosin binding sites?
A
Pull on the actin filaments using the energy of ATP: cause the sarcomere to shorten
