CSULB BIOL 207 Lab Final Study correctly answered

CSULB BIOL 207 Lab Final StudyWhat is the function of skeletal muscle? - correct answer Contracts to cause bone movement What are the structures of the skeletal muscle? - correct answer Tendons and muscle fibers What does muscle fibers contains? - correct answer Bundles of protein filaments What are the two protein filaments in muscle fibers? - correct answer Actin (Thin) and Myosin (Thick) What does the Sliding Filament Model state? - correct answer Actin and myosin DO NOT shorten, but instead slide past each other during contraction What is the smallest unite of contraction of inside muscle fibers? - correct answer Sarcomere What does it mean if the sarcomere is longer than usual? - correct answer The muscles fibers are relaxing What does it mean if the sarcomere is shorter than usual? - correct answer The muscle fibers are contracting What is the first step of muscle contraction? - correct answer The action potential travels down the motor neuron axon What does the action potential cause during muscle contraction? - correct answer Release acetylcholine and muscle depolarizes What happens at threshold during muscle contraction? - correct answer Voltage-gated Ca2+ channels in plasma membrane open and release the ions in sarcoplasmic reticulum to open