Like this study set? Create a free account to save it.

Sign up for an account

Already have a Quizlet account? .

Create an account


ability of a muscle to be stimulate by a motor neuron


ability of a muscle to shorten when stimulated


ability of a muscle to relax when contraction is done


ability of a muscle to continually contract and relax over and over and not change shape

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


can consciously control the muscle


controlled subconsciously

self exciting

one muscle fiber is stimulated by a neuron which then stimulates other muscle fibers of the same type


contracts with a pattern


appears striped as a result of filaments in the muscle tissue,needed for strength of contraction

histology of skeletal muscle

1.connective tissue,endomysium,epimysium,tendon/bone,perimysium,fascia

functions of skeletal muscle

movement,posture,stabilize joints,produce heat

skeletal muscle

organ,made of fascicles with connective tissue


bundle of myofibers with connective tissue

muscle fiber or cell (myofiber)

contains cytoplasm,plasma membrane, and nuceli,made of myofibrils


contractive unit of a myofiber,made of myofilaments


sliding filaments made of proteins called actin and myosin


plasma membrane



sarcoplasmic reticulum

specialized smooth ER


contractile unit of a myofiber,"working unit" of myofibirl,distance



Z lines

discs, separate sarcomeres

A band

dark band, actin and myosin overlap with each other

I band

light band,just actin


thinner myofilament


thicker myofilament

cross bridges

part of myosin filaments to attach to actin filaments


found in myofibrils

motor unit

one motor neuron and all the myofibers it stimulates

neuromuscular junction

junction of a motor neuron and myofiber

motor neuron

causes the response

axon and axon terminals

end of the motor neuron

synaptic end bulb

the tips of the axon

synaptic vesicles

inside synaptic end bulb, hold the neurotransmitters


chemical messenger that carry impulses through the gap

synaptic cleft (gap)

space between a neuron and a myofiber

neurotransmitter receptors

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


continued contraction, no relaxation, effects are added, open wound, caused by a bacteria

muscle cramps

break down glucose without O2, produces too little ATP, lactic acid builds up and causes muscle fatigue, anaerobic


food poisoning in which bacteria toxin causes paralysis, dented cans


bacteria from botulism, gets rid of wrinkles


speed up impulses to neurons and muscle fibers, cocaine, speed, caffeine


slow down impulses, alcohol

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions and try again


Reload the page to try again!


Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

Voice Recording