Describe how muscle contraction occurs. Use all of the following words in your explanation--be specific. Word Bank: Sarcomere, Neuromuscular Junction, Sarcoplasmic Reticulum, Myosin, Troponin, Actin, Tropomyosin.
Motor Neuron, Acetylcholine, Calcium, ATP, Myosin Head, Hydrolysis, Shorten/Elongate, Contract

Explanation:

A) neuron releases a neurotransmitter to stimulate the muscle

B)Sarcoplasmic reticulum release calcium ions myosin heads attach to the actin filaments

C) ATP is converted to ADP when the myosin head change shape

pulling the actin filament

D) Myosin heads pull the actin filament together

a problem could be dealing witj emotional stress..all of these factors contribute to emotional stress.