Chapter 9 Muscles And Muscle Tissue

Cardiac and skeletal muscle are _____ striated Cardiac and smooth muscle are also _______ involuntary smooth muscle is typically found within the walls of hollow visceral organs, blood vessels, and ____ airways A skeletal muscle cell is called a _____ fiber muscle epimysium epimysium perimysium perimysium fasicicles and endomysium and muscle fibers. fascicles Functional unit of muscle contraction is the sarcolemma, sarcoplasmic reticulum, and _____ sarcoplasm Thin myofilaments are composed of myosin, actin, and light chain _____ myokinase The sarcoplasmic reticulum of muscle fibers is a storage site for calcium ions and releases the calcium when stimulated. by action potential _ tubules are continuous with the sarcolemma T An action potential is a rapid up and down shift in the voltage across a membrane from the negative resting to a positive ____ value resting membrane potential is maintaned by sodium potasium ATP pump Acetyl choline is the neurotransmitter released from vesicles in the synaptic knob of the ____ neuron Excitation-Contraction Coupling 1.) Nerve signal 2.) Calcium is released 3.) ACh diffuses across synaptic cleft 4.) Binding causes a comformational change 5.) K+ gates open 6.) Depolarization spreads along sarcolemme 7.) depolar runs through T Tubules 8.) Ca2+ diffuses out of SR and binds to troponin 9.) Active sites exposed 10.) ATP causes release of G-Actin A ___ unit consists of a motor neuron and the muscle fibers it innervates. motor The amount of tension generated by a muscle and the force of its contraction depends on how relaxed or contracted it was prior to ________. stimulation Concentric muscle contraction ecentric muscle curling up weight going down