muscle tissue

Created by ragharocks 

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excitability

ability of a muscle to be stimulate by a motor neuron

contractility

ability of a muscle to shorten when stimulated

extensibility

ability of a muscle to relax when contraction is done

elasticity

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

voluntary

can consciously control the muscle

involuntary

controlled subconsciously

self exciting

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

rhythmic

contracts with a pattern

striations

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

fascicle

bundle of myofibers with connective tissue

muscle fiber or cell (myofiber)

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

myofibril

contractive unit of a myofiber,made of myofilaments

myofilament

sliding filaments made of proteins called actin and myosin

sarcolemma

plasma membrane

sarcoplasm

cytoplasm

sarcoplasmic reticulum

specialized smooth ER

sarcomere

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

myofiber

striations,multinuclei

Z lines

discs, separate sarcomeres

A band

dark band, actin and myosin overlap with each other

I band

light band,just actin

actin

thinner myofilament

myosin

thicker myofilament

cross bridges

part of myosin filaments to attach to actin filaments

myofilament

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

neurotransmitter

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

tetanus

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

botulism

food poisoning in which bacteria toxin causes paralysis, dented cans

botox

bacteria from botulism, gets rid of wrinkles

stimulants

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

depressants

slow down impulses, alcohol

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