What role does the motor neuro

What role does the motor neuron play in stimulation of musclecontraction?
What role does the sarcoplasmic reticulum play in musclecontraction?
What is the difference between aerobic and anerobic musclecontraction?
What happens in a reflex response?


1. Muscle contraction begins when thenervous system generates a signal . This signal is called as actionpotential , travel through a type of nerve called a motor neuron .At the neuromuscular junction motor neuron reaches a muscle . Achemical called neurotransmitter (acetylcholine) is released at theneuromuscular junction which binds with the receptor on the outsideof the muscle fibre. This start the chemical reaction within themuscle .

2. Sarcoplamic reticulum storeintracellular calcium ion . When the muscle is stimulated , calciumions are released from its store inside the sarcoplamic reticulum ,into the sarcoplasm .

3. With adequate fuel and oxygen(aerobic) , muscle cell can contract repeatedly without fatigue .During anaerobic condition (higher intensity exercise) , musclecells must rely on other reactions that donot require oxygen tofuel muscle contraction . The anaerobic metabolism in cells producewaste molecule that can impair muscle contractions (fatigue) .

4. In reflex action , when receptorsof sensory organ sense the danger , they send signal throughsensory neuron to spinal cord which passes the signal to otherinterconnected neurons . It is then received by relay neuron whichis present in spunal cord . Immediately, spinal cord sends backsignals to the muscle through motor neuron . And the muscleaatached to sense organ move the organ away from danger .

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