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skeletal muscle tissue
attached by tendons to bones, multinucleate,parallel fibers,striated,movement of skeleton and posture,voluntary,contracts quickly
smooth muscle tissue
walls of hollow organs, ex:bladder,vessels,digestive,spindle shaped, single nucleus, not striated, movement of materials in organs:peristalsis,involuntary, rhythmic,self exciting,very slow
cardiac muscle tissue
only in the heart,striations, single nucleus,intercalated disc,branching fibers,pumps blood,involuntary,self-exciting,rhythmic,slow
one muscle fiber is stimulated by a neuron which then stimulates other muscle fibers of the same type
appears striped as a result of filaments in the muscle tissue,needed for strength of contraction
a spot on the sarcolema (plasma membrane),receptor sites that receive neurotransmitters
impulse from motor neuron to myofiber
dendrites of motor neuron are stimulate causing polariz,depolariz,repolariz (action potential), Na+/K+ pump, action potential causes impulse to travel from dendrites,cell body,axon,axon terminals,synaptic end bulb,synaptic vesicles of motor neuron,synaptic vesicles release neurotransmitters(ACh), ACh travels across synaptic gap to ACh receptors on the sarcolemma of myofibers motor end plate
impulse in myofiber
sarcolemma of myofiber becomes permeable to Na+, Na+ enters sarcolemma and causes an action potential in the myofiber,acetyicholinesterase (AChesterose) degrades the ACh in the receptor sites after stimulus is received,action potential travels across surface of sarcolemma to S.R.,S.R. releases Ca+ which stimulates sliding filament theory
sliding filament theory in myofiber
Ca+ travels from S.R. through sarcoplasm to myofibril,Ca+ causes actin binding sites to open, myosin filaments cross bridges attach to binding sites on actin filaments,cross bridges "grab" onto open binding sites, when cross bridges grab binding sites, it causes sliding of the actin myofilament along myosin myofilament, sarcomeres of myofibrilic and all of myofbiers adn part of muscle shorten and contract
break down glucose without O2, produces too little ATP, lactic acid builds up and causes muscle fatigue, anaerobic
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