Explain the following questions in detail.
Answer variants:
Relaxation occurs when nerve signals continuously stimulate the muscle.
The neuromuscular junction is the meeting point of a motor neuron and a muscle fibre.
Electrical impulses remain electrical and never convert into chemical signals.
Muscle contraction occurs due to shortening of muscle fibres.
Sensory neurons directly cause muscle contraction without involving motor neurons.
Helium is not present in Earth’s atmosphere.
How are muscle movements directed by the brain through nerve pathways and the neuromuscular junction?
Correct statement 1:
Correct statement 2: