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Muscles study stack
muscles
| Question | Answer |
|---|---|
| occpitofrontalis | raises the eyebrows |
| orbicularis oculi | closes the eyelids causes crows feet and wrinkles at the corner of the eyes |
| orbicularis oris | puckers the lips |
| buccinator | flattens the cheeks |
| zygomaticus | smiling muscles |
| levator labii superioris | sneering |
| depressor angulii oris | frowning |
| mastication | 4 pairs of mastictaion muscles |
| sternocleidomastoid | lateral neck muscles and prime mover |
| thoracic muscles | muscles that move the thorax |
| diaphragm | accomplishes quiet breathing |
| trapezius | rotates scapula |
| pectoralis major | adducts and flexs the arm |
| latissimus dorsi | swimmer muscles |
| deltoid | attaches the humerus to the scapula and clavicle |
| tricpes brachii | extends the forearm |
| biceps brachii | flexes the forearm |
| brachialis | flexes forearm |
| brachioradialis | flexes and supinates the forearm |
| retinaculum | strong band on your wrist |
| flexor carpi | flexes the wrist |
| extensor carpi | extends the wrist |
| flexor digitorum | flexes the fingers |
| extensor digitorum | extends the fingers |
| gluteus maximus | buttocks |
| quadriceps femoris | extends the leg |
| gluteus medius | hip muscle |
| sarotorius | flexes the thigh |
| hamstring muscles | flexes the leg and extends the thigh |
| gastrocnemius and soleus | form the calf |
| achilles tendon | flexes the foot and toes |
| peroneus | turn the foot outward |
| intrinsic foot muscles | extend abduct and adduct the toes |
| contractility | the ability of skeletal muscles to shorten with force |
| excitability | the capacity of skeletal muscle to respond to a stimulus |
| extensibility | the ability to be stretched |
| elasticity | ability to recoil to their original resting length after they have been stretched |
| epimysium | connective tissue sheath |
| fascia | surrounds and separates muscle |
| perimysium | surrounded by loose connective tissue |
| fibers | muscle cell |
| endomysium | connective tissue sheath |
| myofibrils | extends from one end of the fiber to the other |
| actin myofilaments | thin myofilaments |
| myosin myofilaments | thick myofilaments |
| sarcomeres | joined end to end to form myofibril |
| z line | attachment site for actin |
| I band | consist of actin |
| m line | dark staining band |
| resting membrane potential | the charge difference across the membrane |
| action potential | the brief reversal back of the charge |
| motor neurons | nerve cells |
| neuromuscular juntion | muscle branch |
| motor unit | single motor neuron and all the skeletal muscle fibers it innervates |
| neuromuscular junction | formed by an enlarged nerve terminal resting in an indentation of the muscle cell membrane |
| presynaptic terminal | enlarged nerve terminal |
| synaptic cleft | the space between the presynaptic terminal and the muscle cell |
| postsynaptic terminal | muscle fiber |
| each presynaptic terminal contains | synaptic vesicles |
| synaptic vesicles secrete a neurotransmitter called | acetylcholine |
| the neuron and muscle cell is rapidly broken down by an enzymes | acetylcholinesterase |
| occurs as actin and myosin myofilaments slide past one another causing the | sarcomeres to shorten |
| when the sarcomeres shorten it causes the muscle to | shorten |
| the sliding of actin myofilaments past myosin myofilaments during contraction is called the | sliding filament mechanism |
| the H and I bands shorten but the A bands | do not change in length |
| muscle twitch | is a contraction of an entire muscle in response to a stimulus that causes the action potential in one or more muscle fibers |
| a muscle fiber will not respond to stimulus until that stimulus reaches a level called | threshold |
| this phenomenon is called | the all or none response |
| the time between application of a stimulus to a motor neuron and the beginning of a contraction is the | lag phase |
| the time of contraction is the | contraction phase |
| the time during which the muscle relaxes is the | relaxation phase |
| if successive stimuli are given you get successive twitches that occur so frequently the muscle doesnt | have time to fully relax |
| tetany | where the muscle remains contracted without relaxing |
| the increase in number of motor units being activated is called | recruitment |
| ATP | adenosine triphosphate |
| ADP | adenosine diphosphate |
Created by:
sewalke6
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