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muscles
| Question | Answer |
|---|---|
| buccinator | flattens the cheeks |
| zygomaticus | smiling muscle |
| orbicularis oris | puckers lips |
| orbicularis oculi | closes eyelids |
| occipitofrontalis | raises eyebrows |
| levator labii superioris | sneering |
| depressor anguli oris | frowning |
| sternocleidomastoid | lateral neck muscle |
| diaphram | acoplishes quiet breathing |
| external tongue | change shape of tongue |
| extrinsic tougue | move the tongue |
| platysma | sheetlike muscle that covers anterolateral neck |
| erector spinae | group of muscles on each side of back |
| thoratic muscles | muscles that move thorax |
| external intercostals | elevate ribs |
| internal intercostals | contract during forced expiration |
| linea alba | tendious area of abdomininal wall |
| rectus abdominis | each side of linea |
| tendinous inscriptions | cross the rectus abdominis at three or more locations |
| trapezius | rotates scapula |
| serratus anterior | pulls scapula anteriorly |
| pectoralis major and latissimus and dorsi muscles | attaches arm to thorax |
| pectoralis major | adducts and flexes the arm |
| latissimus dorsi | powerfully extends the arm |
| deltoid | attaches the humerous to the scapula clavicle |
| triceps brachii | extends the forearm |
| biceps brachii | flexes the forearm |
| bracchialis | flexes forearm |
| brachioradialis | flexes forearm |
| flexor carpi | flexes the wrist |
| extensor carpi | extends the wrist |
| flexor digitorum | flexes fingers |
| extensor digitorum | extends the fingers |
| quadriceps femoris | extends leg |
| sartorius | flexes thigh |
| hamstring muscles | posterior thigh muscle |
| gastronemius and soleus | form calf muscle |
| intrinsic foot muscles | extends foot |
| contractility | shorten with force |
| excitability | respond to stimulus |
| extensibility | ability to be stretched |
| elasticity | ability to recoil |
| epimysium | surrounds conective tissue |
| fascia | outside epimysium |
| perimysium | surrounds fiber |
| myofibrils | fills cytoplasm in fibers |
| sarcomeres | highly order units |
| mysin myofiliments | thick myofiliments |
| actin myofiliments | thin myofilaments |
| a band | darker central region |
| z line | attatchment for actin |
| action potential | reversal back of charge |
| resting membrane potential | the charge difference |
| motor neurons | nerve cells |
| motor unit | single motor neuron |
| synapse | near the center of the cells |
| presynaptic terminal | the muscle fiber |
| synaptic cleft | the muscle cell |
| synaptic vesicles | presynaptic terminal |
| acetylcholine | synaptic vessels create a neuro transmitter called |
| acetylcholinesterase | the neuron and muscle cell is rapidly broken down by enzymes |
| occurs as actin and mytosin myofilaments slide past one another causing the | sarcomeres to shorten |
| when the sarcomeres shorten it causes the muscle to | shorten |
| sliding filament merchanism | myofilaments sliding past myosin |
| the h and i band shortens but the a bands | do not change in length |
| muscle twitch | a contraction of the muscle |
| threshold | muscle fiber doesnt respond to stimulus |
| this phenomenon is called | the all or none response |
| lag phase | the time between an application of a stimulus to a motor neuron |
| the time of contraction is the | contraction phase |
| the time th emuscle relaxes | the relaxation phase |
| tetany | where the muscle doesn't relax |
| atp | adenosine triphosphate |
| adp | adenosine diphosphate |
| the increase in number of motor units being activated is called | recruitment |
Created by:
talanwatts
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