A Muscle Contraction Is Triggered When an Action Potential Travels Along the Nerves to the Muscles. Muscle contraction begins when the nervous system generates a signal. The signal, an impulse called an action potential, travels through a type of nerve cell called a motor neuron.
The answer is (A) because if your joints are not "flexible" then you may tear something, break something, or strain something to the point of failure.
Answer:
because it will make there stomach hurt and it will damage the baby inside the mother.
Explanation:
