What prevents two antagonistic muscles from contracting simultaneously? O Polysynaptic reflexes The myotatic reflex Muscle spindles Reciprocal inhibition QUESTION 2 Motor neurons communicate to muscle at the: neurofiber synapse muscle spindle polar junction neuromuscular junction

QUESTION 3 What is responsible for initiating muscle contractions? Actin Sarcomeres Acetylcholine Myofibrils QUESTION 4 the thick filament that moves along the thin filament. Myosin, actin M line, Z line Z line, M line Actin, myosin

QUESTION 5 move nutrients through the digestive tract and control blood flow. smooth muscles Skeletal muscles Cardiac muscles Striate muscles QUESTION 6 What manages muscles and prevents injury by monitoring the rate of muscle contraction? Muscle spindles O Golgi tendon organs Motor neurons Flexors QUESTION 7