Why does the repeated activation of the muscles cause fatigue?

Which of these is a genetic disorder?

Which organelle is abundant in white fibres of muscles?

What does acetylcholine generate in the sarcolemma?

‘F’ actin is a polymer of ‘G’ actins. True or false?

Which of these is a neurotransmitter?

Which of these ions are abundant in the sarcoplasmic reticulum?

Which of these is not a component of the rib cage?